Something interesting to note here is that this concept was done about 10 years ago. And actually caused lawsuits over the idea of someone being able to leave comments on someone else's web page. Since then, a couple more companies have tried this same basic concept. Now, I wouldn't be surprised if this really takes off. Because there's definitely a heightened sense of community now more than ever. Because there's a lot less trust in government and corporations now than ever (the lawsuits centered around people leaving negative comments on corporate sites). And because this time it's Google.

Customer service via Twitter.

BK's new site amasses everything ad, menu and user-generated.

Mood-based radio.

The site that some claim rips off David Rees comics.