Firstly, I think that MLA could possibly use the features we used in Facebook, such as hooking up with friends using the "Wall" and registering for continuing education classes, roundtables sessions or even sunrise seminars with the "Events" application. They are useful tools.
Secondly, I can see the value of having a Facebook or MySpace for public and college libraries, but I don't think they are appropriate for a hospital medical library, where I am employed. I think the use of wikis among state, regional and national organizations within medical librarianship and a blogg on our hospital library web page would be better than using social networks on our web site.
Thirdly, the privacy issues within hospitals are very important and all the firewalls that hospital libraries have to contend with do not allow for such social networking. It is just not practical, to say the least.
If it wasn't for taking this class, I would have never even gone on these sites. I am glad I had the opportunity to experience what all the younger people are doing. I don't have kids, so this was a learning experience. I liked the fact that you can network and find jobs with ease, you can load your OPAC with ease (I think). Also, you could provide access to Worldcat without the fees of joining NELINET. (I think). The linking abilities seem to be endless. We are a nation of one stop shopping.