For those that missed the original tweet...
...that was followed quickly by:
Well, we recently passed 10,000 followers and it's time to pick a winner:
~/Development/github(master)$ irb
>> require 'open-uri'
=> true
>> user_id = open("http://twitter.com/followers/ids/github.xml").read.scan(/\d+/).sort_by { rand }.first
=> "9848912"
>> user_name = open("http://twitter.com/users/show.xml?user_id=#{user_id}").read[/screen_name>(\w+)/, 1]
=> "tekin"
Congrats to tekin on your free large account for the year!