Here, you hear so much.........
It is almost impossible to keep up with it all and know whose opinions and experiences are trustworthy.
If I spend an hour on a hub, I don't want to spend another 3, promoting it. It is too much to keep up with.
My own advice, branch out, write your best everywhere, and spread your name around. Do not neglect your fellow writers and never your readers, wherever you go.
Very few writers have a best seller from a rough draft. Give yourself some growing room.
Facebook, myspace, linkedin, etc.........just do not interest me.