Well, it's that. Instead of posting a status, you post a picture.

So for instance, I have a friend who posted a picture of her new apartment. That spurred a discussion about it. Pretty simple :)

It's actually more convenient than facebook, at least I found it so. And I don't have to read anyone's stupid post about "I wish it'd stop" or "Never again" or "You're a bitch blah blah blah blah blah. You know who you are" -.-