Regardless of if you knew who the payment was coming from at the time, or what the purpose of the payment was, the transaction did in fact come from TF. What you decide to do with it is up to you, and should depend among other things, if you have provided actual services prior to this post in exchange for the payment. I emailed TF asking him why he created that 1kBTC giveaway thread, however I have not received any kind of concrete answer; either way, you cannot deny that you received payment from TF because the blockchain does not lie.

(I can also assure you that you did not receive a "donation" because you "gave 9 lives to kittens").