I use Twitter, Facebook, writing sites like Biblioscribe, Author's Den, Published.com, and I'm a regular forum user on Lulu.com.
Livejournal.com and twitter.com
None on a regular basis. A friend convinced me to go on Facebook. As much as I love people, the thought of sharing my personal information with the world is too much for me. I research all the time and plan to access some of the ones mentioned on this site.
Twitter, mostly. Sometimes, facebook. I have a tumblr account but, I'm still finding out how to use it.
HubPages, Care2, PeerPower, LinkedIn, Facebook, Twitter (Hootsuite), Windows Live, AOL and other professional type websites.
I love using Twitter, I'm @AboutLondon - as I get to 'chat' with other London lovers and I can pass on tips. And, obviously, I share information on my site: http://golondon.about.com
Authonomy to diecuss my novella, and my blog where i show my poems.
I frequently visit www.postsecret.com because people share their biggest secrets and experiences on there!! I don't share any of my stuff on there but I will one day!
Facebook, twitter, and foursquare. I only check into places I want to go to on foursquare. It doesn't always mean I'm there though. And for those of you who say that's like lying, I could care less, you pin-headed moralistic sticklers. Why don't you go suck on an egg and tell your mommy.
I've been using Facebook to promote a current production of my play SUBDIVISION, at the Gorilla Tango Theatre in Chicago. I'm still getting the hang of Twitter. Playwright Adam Szykowicz has been interviewing a different playwright every day. There's a lot to be learned there. Here's my recent interview: http://networkedblogs.com/6BIjg
There's also my site: www.rubencarbajal.net
There isn't really anything, If I share experiences it would be on facebook between my friends that write. though I do sometimes talk about writing to people of Wattpad.com and Fictionpress.com
I have an author forum at sffworld.com and a page at authorsden.com , but most of my time online is devoted to research. There always seems to be something that needs doing, but I always try to respond to posts at either of those sites as well as my own site rstuttle.com .
I participate at kujakupoet @ Twitter and M. Kei on Facebook. I find Twitter to be a useful forum for micropoetry such as tanka, but not Facebook. I also blog at kujakupoet.blogspot.com and NarrowSeas.blogspot.com. I find Goodreads.com to be the most user-friendly and featureful of the social networking sites devoted to books. I have tried the Kindleboards for users of Kindles because I think ebooks are an important development in publishing, but I find the Kindleboard very awkward and confusing. I also participate in the forums at Astrodene's NavalFiction.com The forums are much cleaner and easier to use than some other interfaces out there and I post pictures and other items from my nautical career there. I also host some email lists for tanka poetry, such as the Tanka Roundtable, the Kyoka Mad Poems elist and the Tanka Sequences elist.