Just wondering which, if any, social networking sites you belong to and if you've used them to promote your practice at all?
If so, have you found it a useful tool for bringing forth potential clients and/or new projects?

Please elaborate on where you keep profiles, how much time you spend on each, and what value you see it bringing to your practice.

(This thread was inspired by a question asked at another thread)

A few examples of social networking sites (if you use other please feel free to mention them and list the reasons why you find them useful in building your practice):
MySpace
LinkedIn
Facebook
Friendster
Digg
Sk*rt
StumbleUpon
etc...etc...

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