(I got this game from a board I frequented several years ago)
The point of this game is to post something you know about the person who posted above you, I will post an example below.
If Kat were to post and I posted right after her I could say something like, "Created Tamagotchi Social Sphere", or "Her favorite tamagotchi character is Mimitchi".
It can even be as simple as their post count if you don't know anything else, but this game could also help people to get to know eachother in an unconventional kind of way.
Be careful that you don't get too personal, if someone revealed something to you in private, or it's something like age/specific location, it might not be the best idea to use it here, but otherwise you can be as creative as you want.