I really enjoyed the social web class.  I was initially reluctant to give LinkedIn a chance because even though up until know I didn't have a LinkedIn account, I was constantly getting invites from people who wanted to "connect with me on LinkedIn" - so that sort of turned me off to it.  But, now, the changes that they have made makes a huge difference and I am looking forward to using it more.  I also have been using Twitter and my Diigo account a lot to bookmark articles and other interesting things I find.  I actually really value my Diigo because it is so easy to use and very handy!!!  I know a few people have mentioned Pinterest, and I want to chime in on its usefulness as well.  I included a screen shot of my "school" board.  I use it heavily for ideas for school.  I do a lot of art and sensory activities in my classroom and most of my ideas come from here.