What is Enterprise 2.0?
Let’s here what Andrew McAfee says about that:
The concept Enterprise 2.0 was firstly presented by Professor A.P.McAfee in 2006 when he suggested that the traditional tools for knowledge management are not enough for effective knowledge sharing and creation. He said that there are new technologies available which could significantly help in knowledge management and called them Enterprise 2.0. 
So Enterprise 2.0 brings Web 2.0 into the office. Web 2.0 means that World Wide Web is interacting with its users i.e. it enables the dialogue between web and the user and is hence less passive than previous Web 1.0. Web 2.0 shifts the focus from local to networks and it also increases the power of end-users. It also gives users the opportunity to create and share the content by themselves and it is also the tool for communication. Web 2.0 emphases the use of social networks for solving problems and manage information. 
Many of us know Web 2.0 via social network and media sites as well as video sharing and collaborative consumption sites. So Enterprise 2.0 integrates company’s intranet and extranet as well as business processes improving the collaboration between employees, management and customers. There are several different of tools for integrations as we can see below (Enterprise 2.0 tools). 
In overall Enterprise 2.0 shows how social media tools are used for enhancing the knowledge sharing in companies, between different companies and also between customers and stakeholders. Hence Enterprise 2.0 could be seen as a platform which makes knowledge visible requiring that the content of the knowledge information has to be searchable, linkable and changes should be traceable. Also one has to be able to classify the content. 
Knowledge could be tacit or explicit, as we all know. The explicit knowledge can be seen as a visible, such is reports and documents but tacit knowledge is something that exists in people’s minds. So it is much easier to share explicit than tacit knowledge. But it is just the social media software tools that could help people to communicate, create information together and to share their tacit knowledge. 
Enterprise 2.0 tools
Although the tools are discussed more detailed in blog pages ‘Social media tools’ and ‘Web 2.0 technologies’ here the main tools for Enterprise 2.0 are presented and especially how they are used in the company environment.
Enterprise 2.0 brings various tools, which many of us are using in our personal life, into the offices and change the way enterprises have operated before. Especially it affects how the information flows between different business units, offices globally as well as between different companies (sub-contractors) and customers. So it enhances overall communication.
One form of Enterprise 2.0 is the business wiki which is tool for communications even in global level giving the opportunity to share the information and enable to edit it. So it makes possible to people working at different locations to work together effectively. Wiki also makes possible to distribute the information and replace the old fashioned FAQ systems; it can be used as a substitute for knowledge base and solve their problems. Wikis are probably best known from Wikipedia which includes beside the information also the links between different pages increasing the knowledge sharing. 
Wiki can also be used in meetings. It can act as data storage for data related to the meeting. It also enables large extent of people to participate in the same meeting. For example IBM held the wiki meeting where over 100 000 people participated online. Wiki can hence be a tool for large projects to centralize organization and information and make meetings more efficient and open. 
The other Enterprise 2.0 tool is blog which can be used as a channel for distributing information for the whole company and it can also be used other way around: it could be the opportunity for employees to ask questions and get answers.
Blogs are usually very personal pages which can be equated for diaries and they are posted in chronological order. In Enterprise 2.0 environment both reader and author of the blog are united in communities constituting the social network.  There is also a possibility to share information in so called microblogs which are blogs with limitations in the volume, just like Twitter limited 140 symbols.  The most popular tool for microblogging is yammer.com.
Social networking is also a big advance of Enterprise 2.0, not only bringing people around the world together easily, but it also helps to find right skills and knowledge. For example people can make their own profile where they are indicating their know-how and then the company could find the right skills for right projects. It is also important to be able to find right documents and the social bookmarking is a suitable tool for that; it allows users to mark and categorize different piece of information and hence it easy to find them afterwards. This comprises user categorization system: folksomies. [4, 7, 8]
There are already Web 2.0 online tools, such as Twitter and Facebook, available which can be used for enterprise purposes by integrating them with online tools. Nowadays it is also possible to build social media functionalities into an enterprise resource planning (ERP) system. For example wiki integrated to ERP helps worker to find right information quicker and also decreases the amount of training time for using ERP system. 
The use of Enterprise 2.0 to knowledge creation
Enterprise 2.0 enables to combine several people’s knowledge instead of one individual expert. So the outcome will be the wisdom of crowds.  Enterprise 2.0 can also be seen as a way to increase interaction and then people are more aware of the work done by other teams, which increases also the trust among the whole company members. The products produced together using social network tools are the outcome of collective intelligence and it often increases motivation in the organization because it increases the awareness of everyone’s tasks. [3, 6]
Many Web 2.0 tools create positive atmosphere for innovations and new ideas, which can be created via discussions and brainstorming where relevant information is gathered up and put together perhaps in a new innovative way. [11, 12, 13]
Enterprise 2.0 tools in the business environment can be seen as the facilitators for SECI model processes (introduced by Nonaka & Takeuchi in 1995) where tacit knowledge will be transferred to explicit knowledge by externalization; the tacit knowledge is articulated and written down so it can be shared to others. The explicit knowledge can be further on collected and combined to a new explicit knowledge. When people are using this new created explicit knowledge by internalization they will form their own view and understanding about it and hence it will become a new tacit knowledge which could be shared with other individuals through conversations (socialization).  The figure below summarizes very well the different tools used in different processes.
SECI model and Enterprise 2.0 tools by Chatti et al 
So Enterprise 2.0 tools can support different transformation phases; in externalization blogs, wikis and other social forums help the tacit knowledge to become explicit, in the combination process bookmarks and tags are useful in putting together already existing written information and create new knowledge. In the internalization process all kind of information sharing tools that enable e.g. learning by doing enhances the explicit knowledge for becoming tacit and different communities serve platforms for transferring tacit knowledge from individual to another via socialization.
What could hinder knowledge sharing? The most important issue for successful knowledge sharing is that the culture in organization encourages open and free communication and knowledge sharing. The other important fact is that the employees are able to use the right tools for knowledge transfer. This means that norms of Web 2.0 have to be implemented to the enterprise in a such way that it fits to company’s culture and at the same time they are controlled and centralized being, however, more efficient than traditional knowledge management systems.  Enterprise 2.0 tools increase most of all visibility; visibility of knowledge and visibility of individuals’ and teams’ expertise.
If you are interested to find out how the companies are feeling about Enterprise 2.0 and what kind of user experiences they have, there is a quite nice summary done by Jacob Morgan  about over 50 companies and how they have managed to incorporate social networking tools to their strategies and business goals. There is e.g. the case of Vistaprint which try to improve user experience of Enterprise 2.0 and integrate various tools in it for versatile functions. Vistaprint is using wiki platform and their employees have found it very easy to use.
Although it sounds wonderful to use Enterprise 2.0 there could also be some difficulties in implementing it to company’s everyday life. Jacob Morgan has reported  nine reasons why there could be some challenges in the adaptation of Enterprise 2.0. The challenges could relate to the fact that it is difficult to use or people are not seeing the reasons and benefits for using Enterprise 2.0 tools. Also the organization culture has to support the use of tools.
So for summarizing I just want to say that let’s us give Enterprise 2.0 a chance. There are surely more benefits than disadvantages.
Source: datamation.com 
 Gordeyeva, I. (2010) Enterprise 2.0: theoretical foundations of social media tools influence on knowledge sharing practices in organizations. MasterThesis.
 Boeije, R., Vries, P. D., Kolfschoten, G. L., & Veen, W. (2009). Knowledge Workers and the Realm of Social Tagging. Proceedings of the 42nd Hawaii International Conference on System Sciences – 2009, pp.1-10.
 Levy, M. (2009). WEB 2.0 implications on knowledge management. Journal of Knowledge Management, 13 (1), pp. 120-134.
 Böhringer, M., & Richter, A. (2009). Adopting Social Software to the Intranet: A Case Study on Enterprise Microblogging. Proceedings Mensch und Computer 2009, pp. 1-10.
 Tapiador, A., Fumero, A., Salvachua, J., & Aguirre, S. (2006). A Web Collaboration Architecture. International Conference on Collaborative Computing: Networking, Applications and Worksharing, 2006, p. 12.
 Lykourentzou, I., Papadaki, K., Vergados, D. J., Polemi, D., & Loumos, V. (2010). CorpWiki: A self-regulating wiki to promote corporate collective intelligence through expert peer matching. Information Sciences, 180(1), pp. 18-38.
 Angehrn, A., Luccini, A. M., & Maxwell, K. (2009). InnoTube: a video-based connection tool supporting collaborative innovation. Interactive Learning Environments, 17(3), pp. 205-220.
 Li, J. (2007). Sharing Knowledge and Creating Knowledge in Organizations: the Modeling, Implementation, Discussion and Recommendations of Weblog-based Knowledge Management. 2007 International Conference on Service Systems and Service Management, pp. 1-6.
 Cress, U., & Kimmerle, J. (2008). A systemic and cognitive view on collaborative knowledge building with wikis. International Journal of Computer-Supported Collaborative Learning, 3(2), pp. 105-122.
 Nonaka, I., & Takeuchi, H. (1995). The Knowledge- Creating Company: How Japanese Companies Create the Dynamics of Innovation. Oxford University Press.
 Chatti, M. A., Klamma, R., Jarke, M., & Naeve, A. (2007). The Web 2.0 Driven SECI Model Based Learning Process. Seventh IEEE International Conference on Advanced Learning Technologies (ICALT 2007), 5, pp. 780-782.