This movie comes at the perfect time with the craze of Pokemon Go; a time when you literally see millions of people obsessed with an app - where you can find videos of hordes of people in NYC all running after a particular Pokemon.
This is essentially the premise of the movie: a new app (game) comes out that takes teens in a particular city by storm, except the consequences can be much graver.
As to not give anything away, I try to be brief:
The acting was great; the pacing was great, the color pallet and tone of the movie were all top notch.
That being said, the plot - as it developed - felt "obvious", I wasn't surprised by anything and I wasn't ever emotionally "moved." The movie knows what it is, and it does it pretty well - it's a teen thriller.
What the movie explores is far more important: the way people interact with each other when they are hidden behind a wall of anonymity. The movie has a good message.
The BOTTOM LINE: I rate movies on whether it is worth spending the $$$ to see at a theater, in my opinion this one is worth seeing at a matinée showing ($5), but probably not dolling out $12 - $15. I hope that helps.