I have been studying the way to communicate my good bizz ideas across the Web, and maybe find a buyer, a partner, an investor or other kind of supporter.
I have some expertise in SEO, so I can rank my sites quite well in Google and Yahoo. However, there are social networks that are faster and probably more targeted.
So, I am experimenting with Digg, Meneame and many others.
It is not easy to get a news promoted by those sites, unless you have a lot of time to spend increasing your karma.
This is done by reading many news every day and voting the best ones.
The links that I obtain by publishing in those sites are very helpful for my medium-term efforts of ranking into Google. So, both strategies are concurrent.