Good point that the headline numbers look fine until you check the pattern behind them. The same logic applies to Instagram influencer vetting: I compare engagement across the last 10-12 posts rather than one, and check whether follower growth arrives in sudden jumps that engagement never follows. For the growth-history side, igtrackr (I work on it) is a free tracker that shows a public account's follower count and recent follows, which makes those jumps easy to spot before you sign a campaign.