Social Media - what areas of academia & student life would it be most suited for?

This mind map is looking at where social media would be most useful for students & academics.  I did a very rough map yesterday of the ways that we could use social media to promote our library services.  A couple of hot topics in the academic library at the moment are Information Literacy and Academic liasion.  Wisekids has got me thinking about how social media can be used to spread information and awareness.  But you can't just do the social media for everything.  Much time and effort must be invested in how we invest in social media and where it's most likely to be effective.