K2 and comments...

Thomas,
Absolutely. The best example we have is our own blog, below:
www.sourcecoast.com/blog/extensions/link...-joomla-v11-released

There's an easy content plugin we have which can automatically add social buttons (FB Like, LinkedIn Share, Twitter Share, and Google +1) as well as Facebook Comments to all K2 content. For some information on the configuration options, you can see our demo page below:
demo.sourcecoast.com/

Hope that helps,
Alex