Can anyone tell me about their experience with ffffound?

I’m a photography student, and image sharing is very important to me. Do you find that ffffound is a good medium for image sharing? Do you think that more accessible networks like flickr, facebook, and tumblr are better because of the more open nature (ie not requiring an invitation)?

On a side note: I’ve been searching for an invitation to ffffound, and I was thinking that the internet-savvy cast of characters on fluther may have one laying around that they’d be willing to use on a fellow jelly. Anyone have one or know someone who does?