I
use LiveJournal, and almost everyone on my friends list (about 50 people) is a FIRST person. There's also a
FIRST community set up in LJ, which is pretty active during the build.
With Livejournal, you can download clients to make updating your blog easier - you don't have to deal with doing it through their webpage, and it gives you all the tags you'll need to work with, and will format entries for you.
Someone said before that LJ gets slow, and it does from about 6-9 CST. The other 21 hours of the day though, it's fine.