Why won't the facebook icon on my iphone show up?

I downloaded facebook on my iphone 4s, it says "installed" and everything, but an app icon never appeared for it. When i go to the app store, next to the facebook app it just says "OPEN" so i can't re-install it and the only place i can access it. Can someone tell me how to make the icon show up please?

Why is my iPhone 5 sending messages by itself?

I've been pretty busy this morning, so I haven't been able to message my boyfriend back very quickly. Twice today, I'd send him a message, then a while later I'd look at my phone again and see that there was messages I didn't send to him. First I saw a message to him saying "I love you" then he said "I love you too" and then another message I didn't send to him saying "I love you more." I thought maybe I just forgot, but now I'm noticing more messages being sent to him that I didn't send. What's going on?

Where can I buy a thermo iphone 3g case?

I want an iPhone case like the ones in the pictures, but all of them are for the iPhone 4. Can I find one for the iPhone 3g? If so, where?

http://www.macrumors.com/2012/01/17/thermochromatic-iphone-cases-have-a-different-look/

How come seri doesn't work at all?

I have an iPhone 4S and seri doesn't work. I say "call me Jack" and it replies with "I don't have that in your address book." In the commercial someone was able to say "call me rocker dude" and it worked for him. Also there's not much else to do with seri anyways. For example, you don't need seri to do a google search for you.

How to transfer games from my iPad to my iPhone?

I used to like to play Subway Sufers (if you've ever heard of it) on my ipad. I got an iPhone and I downloaded the app on there. I connected the app to my Game Center account, but all the data I unlocked on my ipad isn't on my iPhone. Can I make it so my iPhone has the things I unlocked on my ipad?

2 iPhones on the same account?

So I have one ITunes account. And my dad has a iPhone so we just put him on my account. But recently I just got a new iPhone and put it on the same account. Now all of our contacts are getting mixed up and he can see everything I text because it goes strait to his phone. It's very annoying. How can I fix this?