I suggest that every two days you check your participants posts so that the chance of making it in your spreadsheet to record would not go to waste. It is just hard to think that your effort is going nowhere.
And anymore suggestions from bounty hunters are also good to help bounty hunters.
Do you have evidence for itvmste. As si have checked and got the information about the Facebook ads. They only vanishing the sponsored channels and pages I do not this will complete bunty side.
I believe still we will be able to promote the project with the simple share of high friendlist account in Facebook. Hence they will get the more number of views.
Other than just sponsored ads, it's possible that even posts from users which relate to promoting or advertising ICO content. There's no verification to this but Facebook has not specified.
Also, Facebook may have some bots that automatically shuts down a post with banned content. The post would eventually be put down in just a matter of seconds or minutes, just like when a video is put up with copyrighted music. It would be useless to check even within the span of 2 days.