IPhone update iOS 6. Why can't I get my apps back?

After I updated my iPhone 4S I've noticed that some apps have disappeared. The App Store has chaned and when I looked up Instagram it said open and it opened up but the app did not appear. What the hell? Is there any way I can get these back without going through the App Store looking up what I want and opening up. That's ridiculous.

WHY IS MY IPHONE TAKING FOREVER?

I have the iphone 4 and its literally taking forever to send a text, the bar goes almost all the way… Then nothing and this phone is brand new

Will I use up all the iPhone 5 memory?

Ok so I'm thinking about getting the iPhone 5. I have a 32gb iPod. I'm wondering if the iphone 5 16gb will hold like 2, 000 songs, like 200 pictures, and like 40-50 apps. How much can the 16gb iPhone 5 hold? If this phone doesn't have enough space for me, I'll probably get the Samsung Galaxy S3.

How to upload pictures to Facebook on your iPhone 5?

I know that you can do so by clicking on the picture in your picture roll and go from there, but I'm having a hard time with that. Instead, I want to upload them through the Facebook app itself. When I try to a statement comes up saying that it has no access to my photos/videos. Check privacy settings. I've checked both the privacy setting of the app and my phone's settings… Help?

What's the difference between the iPhone 4 and the 4S?

Am looking on the apple website and the 4S is over 100 more than the 4. What's the main difference in both? Is it worth spending the extra money for the 4S?

Never had an android/smartphone so i wouldnt really know if its the best or not, anything is better than this old phone i have now. Opinions please haha, thanks.