There really needs to be a BugMeNot for Facebook. Or something similar.

edit: Mailinator's alternate addresses occasionally aren't blocked, but I haven't yet successfully received a confirm email :/

Why not just set up a fake facebook profile?

Cause it takes a lot of effort to make a 'fake' facebook profile - I had one and it only lasted a few months before it was locked out pending government-issue ID being sent to them, since I wasn't actually using it for anything more than looking at the occasional thing that required an account I can only assume they monitor for unusual use patterns.

I'm pretty sure you can make a fake Facebook profile, mark it as a test account, then use it to connect to things.

Test accounts can't interact with real Facebook users, but they can be used to log in to sites.

I don't think so, it looks like that might have to be done entirely via the programming API, and you need an application registered to do so (or the access token of another application) because it only works on one application: http://developers.facebook.com/docs/test_users/

You can definitely create a user and then turn him into a test account manually, I've created many test accounts that way. You have to visit a special URL that turns the account into a test account (can't remember it offhand, and I'm not going to post it anyway since if anyone clicks on it then clicks "accept" without looking, it nukes their regular account).

Can the test user then interact with the site in a mostly-regular way? I've never tried, clearly :)

Yes, except for the fact that it can't interact with regular users.

I had success with @safetymail.info

Also if you are using something like the Ghostery Firefox add-on to block Firefox Connect you just get an empty page.