The results from the MLA Social Networking Survey are available. You can view the summary data as well as the charts and graphs. Don't forget to check out the Task Force Blog for further analysis and discussion of the results.
I happy to say that the hospital librarians put in a good showing, 30% of the respondents were hospital librarians. One other interesting tid bit is that a diverse group of library sizes responded. Both solos and libraries with 2-5 staff represented 19% of the responses each and libraries with 20-40 staff represented 20% of the responses.