Ending? (SPOILERS)

I think you're putting too much thought into it. The whole point of that scene is her obsession with social media is a never ending cycle.

To your points:

1. A phone can be tracked
2.Heaven? It's not that deep. She's really at a hospital. The boyfriend phoned it in.
3.He was only forgiving cause she tried to commit suicide, which explains her behavior with him
4.That's usually what somebody is given when you come out at an accident
5.If he saw her video in his hospital bed it's safe to assume that's the nearest hospital
6.He didn't encourage anything, he let her know people care
7.That's the point of the movie, it's all fake, the hashtags, you can be a nobody and then go viral
8. The lesson is that just when she comes clean and you think she'll break the cycle, it happens all over again cause all the messages warmed her heart and she'll no doubt want to stay popular after she gets out, leading to more irrational behavior

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I think they pulled a Taxi Driver with the ending.