what is a signature campaing 
Forget about the signature campaigns. If you are not a senior member with activity of >300, it is not worth the effort. Try other methods to earn Bitcoin, such as freelancing and publishing adverts (I'd recommend Coinurl).
If you are active on the forum, why not get some bitcoins too?
https://bitcointalk.org/index.php?topic=615953.0
of course the rates for lower-rank members are not that attractive, but still you may consider it as a better idea than faucets.