Twitter video reg question

[jp1]

http://www.youtube.com/watch?v=Y8IP-B11XIg

Why is the guy in the youtube twitter reg vid doing this, adding a number to the email. To my best of knowledge that doesn't make the email a catchall. Why is he changing the variant from a 4 to a 2?

 

[step85]

This is the number of syllables in the login. And made for more realistic logins.

 

[jp1]

Ohh ok, also made because max chars in twitter registration is 15, which i just found out now!