Do you use any Social Network?

Do you use any Social Network? How often do you use it? What is your favorite?
Faceook? Twitter? My Space? Google+?

I use Twitter, there's a Twitter application connected with my forum, people can visit my forum through their Twitter login. I don't know if this is beneficial, just checking if it works good.

I am not very experienced with social media, especially with Twitter but I believe that they are really helpful. I usually use Facebook and LinkedIn because they help me to get new employees for my company. Twitter is better for promotion, I know that many new companies use it. MySpace is a perfect idea but only for singers or artists. In conclusion, I have to say that Facebook and LinkedIn are the best because of the professional design and the registered persons.

I do have a linkedin account, not really using it though, just have a profile with several links, I'm not sure how and what to use it for actually.

I personally now have a Facebook and a Twitter account however I spend more of my time on forums than I do on social networking websites now.