I can't figure out why when I try to boost a post, via a paid campaign, it says it can't boost that post; while he lets me highlight the previous ones. I've noticed that every post I publish does NOT let me feature it anymore; while letting me highlight those from the past. I tried to ask facebook for assistance; but i got nothing. Thanks to all.
Facebook just updated their advertising TOS January 3rd or 4th, may have something to do with your issue.