I have Questions about social bookmarking sites

[jennypretty]

I have Questions about social bookmarking sites

Hello,

I have been submitting to high page rank social bookmarking sites, including Facebook, Digg, Twitter, and low traffic social bookmarking sites too.

It takes time to manually submit to all of these social bookmarking sites every time I create a new article on my sites.

My traffic is ok but not much from these low page rank social bookmarking sites.

My question is:

Should I keep submitting my new pages to all of these social bookmarking sites or just Facebook, Digg, Twitter?

Thanks.