I am submitting pages to furl-diigo, mister-wong, blinklist, backflip, jumptags.com..................... I have 600 plus section pages on my site and 7,000 plus product pages as well. Should I add 50, 100..... 600 section pages to these sites? Is this too many, too few? What, if anything does google think about this? Adding 1 link from my site would be pretty worthless due to its size, don't you think? Is this natural link building?