Right now I'm mostly just active on facebook. I do use the others for promoting websites such but I don't use them besides that.
Digg, facebook, stumbleupon, reddit, delicious, twitter. Not easy to manager. Needs a lot of time. these sites are basically social networking and link sumbmission sites. Facebook and Digg are most interesting because of massive traffic they generate.
three facebook , twitter , and hi5 sometimes people consider the yahoo answers as a social network if your one of them then 4 !!!!
I like how you made your website. Can you tell me here or via PM what exactly software did you used for it. P.S. I am mostly active on Stumble and Reddit Unfortunately, there are not much social bookmarking sites which deserve some significant attention
I usually active on Facebook, Twitter and Stumbleupon and I enjoy interacting with new friends on these social network sites.
my daily working sites are twitter, facebook, stumbleupon. some other social media sites like plurk, friendfeed etc.
Twitter and Facebook have become compulsory social media if you want a sound business. Stumbleupon is also a good solution, and so is del.ici.ous. I'm also active on lots of forums.
Basically use Stumbleupon, facebook and twitter. But still social media is not meant for promoting all type of products. So be choosy while using social media.