Didn't look at the website yet, but just from the link: Try Google+. I don't know most people that I circled there. Not that I have Facebook, but when I look at Facebook with others it's more like talking to people you already know. With Google+' trending topics (I don't think Facebook has that, nor is Facebook as content-oriented as Google+) it's easy to see others posting about a popular subject, see their profile and posts, and circle them. And of course exploring topics you like with the Google+ search.

Edit: Submitted. Let's see where this goes :)