Lame_Wolf - 5:43 am on Sep 15, 2010 (gmt 0)
The only purpose I'm doing it is for SEO, for links coming from those social networking sites.
Your time would be better spent on adding decent content for your site, and/or gaining links from related, worthwhile sites. That way, you will get decent traffic.
I've never spent a dime on advertising, not looked for links in over 4 years, never joined social networking sites (unless forced to, to get something removed), and I get IBL's all the time.
And IMO links from social networking sites are pretty worthless. A number use nofollow, and often the URL changes over time, so it never seems to age well like other links do.
Still, if social networking sites are the bandwagon for you, then climb aboard.