I don't think so, it would probably get so sloppy to the point of people posting random porn pictures they find on the web. And there could be a big probably with under age people posting pictures, because Myspace had the same problem on there "Truth Box" app.
It's safer to just not do that, i would be fun, but there is too many people out there that would abuse the right to post pictures like that, and it could lead to lots of legal troubles.