Answer to your Questions.
1) Better to do Social bookmarking in top 50 sites. Book mark on those sites who have lot of traffic such as stumble,digg,reddit etc.
2) Yes, you can submit different URL of same site. There is no problem in it.
3) In twitter,you can't have fan page like Face book, only thing you can have is followers.
Make sure your followers are interested or related to your product or service.
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