first for first

A common comment on popular social media posts that promotes the exchange of "likes," in which one requests a "like" on the first picture on one's own page in return for liking the first picture on the other person's page. Often abbreviated as "F4F." Ever since I started writing "first for first" on famous people's posts, my Instagram pictures have been getting way more likes! A: "I miss when I used to get actual comments, instead of 'first for first' and scams." B: "Well, you're famous now—that's what happens when people's accounts grow." To be honest, if someone comments "first for first" on a celebrity's post, I am definitely not checking out one of their posts!