Unfriended (2015)

The biggest problem with this movie is that it takes place on a computer screen. So be prepared to spend a lot of time listening to characters type and reading their instant messages to each other.

Blair, her boyfriend Mitch, stoner Ken, blond Jess, mean Val, and jock Adam get on a private chat but  another person keeps joining them.  Since no one allowed this other person to join, they try a new chatroom. The mystery person is able to join their conversation again.  Creepily enough, it appears to be Laura, who committed suicide a year ago.

The kids can't get away from her.  She seems to have access to everywhere they go online.  They  even mute the sound, but Laura turns it back on. No one thinks of shutting down their computers or having a real life conversation. Sigh, kids these days.

Blair looks for advise online and finds a website which says you should not not answer message from the dead. This leads to a ton of exposition done through web searches, texts, and watching the kids faces as they're reading the texts.  I'm still wondering how the dead are able to type.

As people start dying and they need help, they use Chat Roulette to try to get the police.  Oh hey naked, creepy, non-English speaking, German guy in any town on the other side of the world. I need the police sent to my home asap because someone is trying to kill me.  Seriously?  Use your cell phone! Or how about texting someone nearby or post on the police Facebook page? It's all going to be quicker than finding someone on Chat Roulette, who is more than likely going to hit because you're a freak and they don't want to be pranked
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This is what you'll spend 90 minutes watching