Been using SB for almost 4 weeks now and I've learn something. QUALITY over QUANTITY!
50000 backlinks in a week might be cool, but is the really focused marketing? Not really. Especially if you're not checking the quality of the links you are blasting.
1. Import your list
2. Do a PR check
3. Take all 9-2 PRs and export that into a new list(use these for your direct money sites. You'll usually get like 10 to 25 nice juicy PR sites. All be on the look out for any possible .edu and .gov links you might come across)
4. Take all your PR1 - 0 and NA links and go ape crazy with those on your buffer sites.
IMO Google rather see you have 100 to 300 nice PR4-PR9 backlinks, instead of 100000 no weight links.
*Correct me if I'm wrong, as I'm still new to this.