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Shot in the dark on the second one, maybe Heir Apparent?
Edited by Daefaroth This signature says something else when you aren't looking at it.
No, it doesn't seem to be that one. I think it was literally just the girl's face on the cover. And half of it was glitchy computer error looking stuff. Thanks, though
I know this was a while ago, but was the second one Hex by Rhiannon Lassiter? It looks like this: 
And from what I remember it fits the plot you describe.
For #2: For some reason, that sounds like Adoration of Jenna Fox, or one of it's sequels, though that's a real shot in the dark
Well, I had to look up the cover, but I think you're right, Kyrillion. "Hex" definitely seems like it fits the bill! Thanks so much!
Edited by lordofthestars
In fact I feel more certain I dreamed this first one than not, but hey, might as well give it a shot. I don't remember anything about this book'd plot except that, at the very end, the main characters had build some sort of platform/tree house living area high above the ground after running away from somewhere? I think the trees were exceptionally large, which made it possible. I can't remember if they were trying to escape something (maybe an evil AI supercomputer who wouldn't be able to harm them way out in the jungle/forest?) I THINK the main characters were a young boy and girl and they may have had an older male companion, and maybe it was the first part in a series... Not sure.
The other book I know existed and that I read it, but I mostly just remember the cover... It was a scifi book, the cover was (i think) of a girl's face, and all black and green and matrixy. It kind of reminded me of the Uglies/Pretties series but it wasn't that. I think it had glitchy effects. I think it was about a teen girl and an older male, and i THINK the girl was like... the key to an uprising against the evil high tech overlord or (again?) supercomputer, and I THINK she was really, like, crabby with the main guy before warming up to him. Also she may die at the end/turn into binary code? Or maaaybe was a robot? Not sure. It was out when I was in middle school, but I have no idea if it was new, but it would have been made sometime before 2008.
I think these are wayyyy too vague to get any for sure answers, but I appreciate it if anyone does have a guess :P