seesmic video feedback intregration platform - for websites/blogs. Also has multiple socialnetwork integration under one desktop client (silverlight) - and also has mobile apps.
charity twitter money fundraiser - with network of sympathisers: using ChipIn, twitter, and blog! to post challenge! - helping raise money for hungry kids...
I had a conversation with an adult learner yesterday who was having a 'wobble' about staying on a course and she said that one of the other learners would not leave her alone on facebook until she said she was coming back to class. Their interaction with a social network had the consequence of her staying in learning.
another blog realted to the power of people in the age of the social networks and social media - probably inspired by clue train manifesto ;o) The McDaddy of revolt against - bad irresponsive and disrespectful business and its practices