Those of you worrying about using Facebook to logon probably don't understand the process. All it does is generate a token verifying your identity. It doesn't grant access to your account or allow Karma to post things on your behalf. For a technical overview of the process, look up OAUTH on Wikipedia. Both Facebook and Google let other websites use their login infrastructure to authenticate users.
Facebook:
https://developers.facebook.com/docs/reference/login/
Certainly, there's a social aspect to it and it's of course possible for Karma to integrate social connectivity on its website. But when you use Facebook to sign in to Karma it will very clearly show you what account permissions it seeks.
That aside, Karma seems neat. And at $14 for 1 GB it's really cheap.
Originally Posted by cordelli
It's not about using Facebook for logging in. It's about using a connection you have no clue if it's legitimate or not to log in. It's way too easy now for somebody to set up a mifi or whatever with their connection name and just sit in an airport collecting people's username, passwords, and even credit card information (because if you are stupid enough to do this, you are probably stupid enough to put in a credit card number for overage charges or verification issues if the fake form asks for it).
This is also a very valid point.