It is kind of like the old 'Six Degrees' site crossed with a dating site - well, you don't have to use it for that, of course.
Of course, I signed up. Now, because I know feeding them a shitload of my friends' email addresses would probably primarily result in my having fewer friends (even if they do swear they don't spam them, or sell them, etc), I won't be doing that.
But if anyone else wants to sign up and end up linked to me, the address I used is email@example.com. Normally I create new addresses for this kind of site, but then people who might know me and put in the address they'd know wouldn't link with me.
Ok, off to bed.