I feel the need for this to be said, as it is evident that a few still do not know this.

When a Minecraft account is posted here, please DO NOT try to log on onto the Minecraft.net website with them. The login system is protected on the website with security questions, and if too many people try breaking the security questions, I believe that the owner of the account is notified via email. That's fine and dandy if the owner of the account willingly gave it away, but if it was cracked, he might change his password and no more alt for you.

If you ever get an account through this site, only try logging in with the Minecraft client, which has no such security measures. Everything will work just fine, I assure you.