Do you have any plan to use escrow? I think thats better so participants can make sure that they can get their weekly payments since you need 100 participants in your campaign and that is huge numbers of participants dude.
I wanted to ask about this too, and also something more:
* Is there indeed no minimum post count per week?
* How long you expect this campaign to go (weeks, months, more)?
Thanks.
I think this will last for long as they are planning to use bot after the 2nd week payment as per stated in the first page. People are really trusting this campaign so it should be the OP's decision if he will use escrow or not.