I realize my mentioning that is akin to the Streisand Effect; however, I feel the need to warn you. This was actually a decent thriller and I usually don't care for the high school ones (in my 30s so they're not made for me). "Who Took Reagan?" would have been way more interesting if the synopsis didn't reveal everything that really isn't revealed until the last twenty minutes. The movie has decent pacing and isn't too campy with the social media aspects. It takes an icky turn which I never like in these movies, and this one doesn't feel believable, but it more or less sets up this movie.
The main negative I have is a common complaint for me: Lifetime always has the hooded attacker portrayed by a completely different body type and sometimes gender than the character it's supposed to be. That annoys me so much.
It's a watchable movie, just avoid the detailed synopsis.