That's not an active campaign signature; he's just wearing it for fun and posting to increase activity points, because I don't see any reason why they'd continue making more than 20 1-2 liner posts every day.
It seems the signature has a referral link. perhaps he is trying to get some referral from the signature. He knows what he wants LOL.
I see two reasons now.
[1.] Referral spamming
[2.] Increasing number of posts.