How many backlinks should I obtain from each SB site?

[richromo]

I am getting backlinks from do follow social bookmarking sites: furl-diigo, mister-wong, blinklist, backflip.......
I am gradually but persistently adding backlinks to my sub pages- section pages of which I have 600 give or take.
Here is my question/s.
Is there a limit as to how many backlinks I should submit to these SB sites? Theoretically they will allow thousands and thousands but what does the almighty google think? How many backlinks from each account is natural?

[islandboy9]

I don't think there is a limit since Google 'measures' your popularity by the number of backlinks you have with other sites. Of course you know that the more backlinks you have, the more traffic you will possibly get. Can you send me more sites where I can submit my site and blogs? Can you list my sites on yours and let me know if you want me to list you on my blogs? PM me. Thanks.