Badgeville is a badge system for web publishers allowing them to reward their users for checking-in and participating on their site. The idea is to get users to game their activity on the site. They have a had a $2.5 million series A funding round so far.
The startup has come out of the Netherlands but has also put down a base in Palo Alto, CA. It has a white label social loyalty, rewards, and analytics platform.
We did a fairly extensive review here, since Badgevill has already appeared at TechCrunch Disrupt, but the skinny is that if users do things on your site, like comment or Like a page, they get badges and eventually rewards. And the site gets more traffic and can thus selling more ads.
Badgeville already has 10 customers signed up representing 400 million monthly pageviews.