The question will resolve to "Yes" as long as Instagram and Facebook (the apps) will not be owned by the same parent company.
* Official GuessWell games are settled by GuessWell
Official GuessWell Game Technology Finance
You're considered a winner if your latest prediction turns out to be correct. The game pool will be distributed among the winners proportional to each winner's duration of the latest prediction.
For example let's say the game pool is 100 coins and there are 2 winners: Alice and Bob. Alice entered her latest prediction 3 months before the game ended, and Bob did so 1 month before the game ended. Alice and Bob will win 75 and 25 coins respectively.
To win:
GuessWell 3 years, 9 months ago
Juan predicted No
GuessWell 3 years, 9 months ago
Pouya predicted No