This must be old because ma.gnolia, now defunct, is #12.

SEO TAGG as well, it's "reported as an attack site" but it has been dead for years.

This type of blog post (and headline) is completely ridiculous. Its a useful resource if you don't know how to use a search engine. The only reason to visit it to help focus.com pad its pageviews.

Social media is as simple as this: Do what you can manage, interact with your customers in a way that you enjoy and that doesn't feel like a chore, and be on the sites that your customers are on.

50 sites is a few to many for my tastes but this is a pretty nice collection of sites that can have an impact

Yeah, I did a similar list a few weeks ago with just 6 items. A business should focus on only a few social sites where its preferred audience resides.

Where is Hacker News? Well maybe its better that people don't know about it