I have spoken about LinkedIn previously, and I do think it is a really interesting network. It is particularly useful to me in this job as I frequently come across the profiles of Johnians (members of St John's College, Cambridge) which I can use to update their record in the Biographical database that I work on with the Biographical Office based here in the library. As to helping me find work... it had not yet been useful... but I hope that when people search for me they can find out a lot about my background using this network.
Finally I took a look at the LIS New Professionals Network, which as I had never used it before I decided to sign up and have an explore. There seemed to be alot of different areas to look at, and it was particularly interesting to see all the posts about graduate trainees such as myself, with questions like 'Graduate Trainees 2011-12 where are you going and what are you doing?' I think it will be very interesting to look at other peoples feedback to questions such as this, and to put my own views forward.