Twitter isn't the only big social network that wants you to ditch the password. Facebook is using its F8 conference to unveil Account Kit, a framework that lets you sign into apps using a phone number or email address. You won't need a Facebook account just to get into that music store or messaging service; you just have to acknowledge a confirmation message (either by email or SMS) to get your foot in the door. The feature is useful worldwide, but it's particularly crucial in developing regions, where having a Facebook account is far from guaranteed.