There is actually, sir yahoo wanted to make the campaign more sucessful by providing only good quality posters. So he verify every person that will carry the name of the company in their signatures.
Yes, like this one for example:
I would like to participate in this campaign below are my information
Btctalk name : yoseph
Rank : Full Member
Current post count : 137
BTC Address : 1NU9Jr3xX7ApAdbpDGXQvzRTgNFzFsZV2r
Wear appropriate signature : Yes
This is everyone accepted through page 6
1 liner spam buster.