Pi Twits

Quite a few twitter accounts are based on pi. I tried all these urls and almost all are registered twitter users, except pi to 8 significant digits and 15 significant digits. Is this a secret pattern?

http://twitter.com/3
http://twitter.com/31
http://twitter.com/314
http://twitter.com/3141
http://twitter.com/31415
http://twitter.com/314159
http://twitter.com/3141592
http://twitter.com/31415926
http://twitter.com/314159265
http://twitter.com/3141592653
http://twitter.com/31415926535
http://twitter.com/314159265358
http://twitter.com/3141592653589
http://twitter.com/31415926535897
http://twitter.com/314159265358979
http://twitter.com/3141592653589793

(also, of course: http://twitter.com/pi )

Also, there are twitter accounts for pi's less famous cousin e (not to be confused with http://twitter.com/e).
http://twitter.com/271828
http://twitter.com/271828183

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