Facebook Mail: Possible Gmail Killer?

Facebook just announced their new “modern messaging system” which they don’t want to call email although in effect, that is what it is,  as now you can have your own @facebook.com email address (and the official facebook staff will now have @fb.com email address). So what exactly are its features? You can control who can send you messages using your privacy settings. Seamless integration between chat, mail, and sms. This means all your conversations which are fragmented between different channels, are saved in your inbox as a conversation (kinda like gmail conversation although that...