The overall story is a neat idea, but it's a bit flawed - maybe. Let me explain (or explore). While watching it, I wondered if this was some kind of statement on rape or promiscuity. If it's about rape, is it that when you're a victim of rape, things will never be the same, that you now attract a darkness that can come after you and find you once again? Scary! And/or that you'll forever be treated terribly by others, is that what "follows"? A bad reputation? Same with if it deals with promiscuity. Reputation, again? Or hell, even a statement about STD's? Am I giving this movie too much credit, thinking it's about something much deeper than it really is? If so, then that's a bummer. I'm just trying to like it, I guess.
The other thing that's tricky is that "It" appears in the form of some person that only the victim (Jay) can see. The problem with this is that it deals with strangers and clones - two archetypes no one in an audience really cares about. We don't know them or know what they're capable of and therefore they aren't scary. Mystery and faked identity is scary and awesome, don't get me wrong, but show me what they do! Luckily, in the beginning we see a girl, who is being followed, get killed - ok now we know what they can do, so the "followers" should be scary. The reason they're not however, is because we see them, and they are in the form of clones, which just doesn't work (especially the Yara clone, like please die already!) That being said, the one clone that was truly scary for me was the one that appeared as the dead girl from the beginning. This made me wonder if perhaps all of the followers are actually people (or in the form of people) the "It" has killed, which is fucking awesome! The only problem is that it came up out of nowhere and then was never discussed. It wasn't clear so I'm not sure if it is part of the story, or if I'm just making crap up. If it is not part of the story, then why WOULD it be scary for Jay to see the previously dead girl from the beginning - she didn't know her, so it's not scary.