The "minimum length" idea is sort of interesting. But is this really an issue? Many early Twitter users with one-letter names still use the service. Not all ear

The "minimum length" idea is sort of interesting. But is this really an issue? Many early Twitter users with one-letter names still use the service. Not all early adopters want a "one night stand" with your product -- many want to adopt it early. Also names aren't universally unique, and this often causes people to get more creative with their handles, which I think is a good thing. I've been building a no-sign-up product, and now I'm getting ready to launch accounts. So recently I let existing users reserve their usernames in exchange for some feedback on the product thus far. I got some great feedback, and now they get an awesome permanent URL on the web. They deserve it, because without the early adopters, there are no late adopters.