I was inspired by the "Crude, Vulgar, Really Should Be Condemned 'Social Media' site" to make a social network for iframes. The only thing you can post is an iframe. Any iframe.
So paste in your favorite embed or whatever, as long as it's an
<iframe> it's cool.
Just a thought, how do you check if a website as protection against iframes? I've always wondered how you would do it. I like this :)