In short: I made a list of sites that support two-factor authentication.
Two-factor authentication makes me feel a lot more secure. Barring (very possible) vulnerabilities in its workings, it's nice to know that a hacker can't log into my account with only my password.
I've enabled it in a few places, but I'd like to enable it pretty much everywhere that I can. I couldn't find a simple list of sites that supported two-factor verification, so I made one.