Why do my iPhone apps keep closing

Everytime I go to open an app such as Twitter, Facebook, etc.It'll open, then there would be the blank page like when it's loading, and then they just close. My phone is a 3GS and it's jailbroken, but I've had it jailbroken for a really long time and it's never done this before. I've tried re-downloading the apps, but it's still doing it. And I tried turning my phone off for about 10 minutes then I turned it on and they're still doing it! Anything else I can try? I really don't want to restore because then I'll lose everything. But if that's my only choice then I guess I'll have to.

Why isn't my music syncing from my computer to my iphone?

I just imported music to itunes, I have already signed up for icoud and did it on my iphone I just can't figure out why the music isn't syncing to my iphone yet

Added (1). Oh and I didn't buy my music from itunes it's a cd

Added (2). Oh and I didn't buy my music from itunes it's a cd

Is there a App that could SLOW DOWN your music on your iPhone/iPod?

I know I'm probably being lazy & I could just look it up on the app store. I'm a guitar player self taught & I've been learning guitar parts by ear since I've been playing I hate using tab sites (like ultimate guitar for ex.). My QUESTION is I want to nail some of those guitar solo's by slowing my music down is there a app like that? Please give me your feed back

IPhone incoming texts don't make sound?

I got it 2 days ago and it's in perfect condition, it was making a text sound the first day. Do you know how to make it ring?
It only vibrates for texts but rings for calls. I have the text alert to ring, i don't know what it's doing?