Social media tools can be used for collaboration. This is where one or many can contribute to and share information in the same place online. Categories include:
- conferencing
- wikis
- social bookmarking
- social bibliography
- social news
- social documents
- project management
- knowledge forum
Social Media for Learning 
Hi, The popular perception of the word social media has always been for casual non-serious sharing of content for entertainment purposes. Well, we can introduce collaborative activities as well, as you rightly pointed out in the blog post. I liked the list of areas you have mentioned. Wikipedia is a good example for social media collaboration. Even knowledge forums and social bookmarking sites are good examples. Thank you. I liked your post. Cheers, Ramkumar