If your account has been shadowbanned (your posts don't show in hashtags or feeds), a sudden burst of positive reactions can sometimes "shock" the account back into good standing by showing user interest.
A: "Hot" refers to two things: 1) Trending reactions (Love/Fire emojis) that rank higher in Facebook's feed, and 2) High-volume speed to make your post look viral instantly. machine liker facebook auto liker auto reaction hot