One of Us Is Next (One of Us Is Lying, #2) by Karen M. McManus, 3 stars

[Jen]

The usual teen lit where the teens save the day and are smarter than the adults. The teens also cause a whole heap of drama, refuse to have actual conversations or talk through problems while they are small and post it all on social media.
Other than that which is actually largely true (even the teens being better at solving through tech bit) this is a fast paced mystery which starts as a copy-cat thing and turns to murder as it gets out of control. Never trust those you meet online seems to be the warning.