See something (or someone?!) you don't recognize? Wouldn't it be cool to upload a pic and have a team of experts examine your find, and post the best answer to your query? Well, that is what you get with idthis.
From the site:
Just snap a photo of something you’d like identified (like a breed of dog, a type of car, that weird gelatinous blob sitting on your plate, or even that celebrity sitting next to you that you can’t remember their name, etc…) and then send it to be identified.