Username or EmailPassword
Just to be fair, I'm not just limiting my last comment to Linux or its distros, because Windows has the same problem. For example, if I want to install an FTP program in Windows, I've probably got at least 25 from which to choose from, 90% of which are pretty much the same. I opinion is that if you're going make an application, website, or anything else for public consumption, don't waste my time by creating more 'me too' crap. If you're going to make something, then make it better or at least different from everybody else.