My facebook account was hacked on iphone. What can I do?

I believe my account has been session hijacked on my phone. I came to this assumption because whenever I log in there's always 2 active sessions instead of just 1 and they are both in a different city.

I have different passwords for everything online, i never share my passwords with anyone, no-one has ever seen me put in my password, i change them every month and my secret Q & A are things that only i know.

What can I do to prevent session hijacking? They are also able to session hijack my facebook app.

Added (1). password contains lower case letters, upper case letters and numbers.

My iphone 5c screen is black and white, like a filter?

So i was out on a walk and when i got home i suddenly look at my phone and its black and white, everything works but its like it has a filter, my friend told me to go to settings and turn of the "Greycyle" thingy and it was already off, its not inverted colors its just black and white, i just got IOS8 last weekend so maybe its ios8. Please help, i love watching YouTube videos and it's frustrating to see everything in black and white. Also when on Facebook i like a status and i can't tell if i liked it cuz i can't see the color. My phone makes me feel color blind, please somebody help meMy iphone 5c screen is black and white, like a filter

Share I upgrade to iPhone 6 Plus?

Share I upgrade to iPhone 6 Plus?

Added (1). iPhone 6 comes out finally! I love it so much for its 5.5-inch big screen. It would bring glorious view experience for playing movies. But my biggest single gripe is that my Apple ID has already registered on 5 different iDevices including my iPhone 5S. I can't enjoy my iTunes movies on my iPhone if I upgrade to 6 Plus anymore! Who can help me?

Why won't my Wi-Fi work at school?

I go to school type in the correct password for the network and then it says i have Wi-Fi in the corner of ny iphone 4s but then when i try to go on any Wi-Fi thing it won't work as if i don't have Wi-Fi it just sits there loading forever and never works. What is wrong with it? How do i fix it?

Why are we less formal in 21st century America?

I know that it's a whole post world war two thing, but I just wanted to get more in depth with it.

In my country club everybody is formal,
When I was at the Ritz last week for a dinner party, everybody was formal there.

But I'm referring to the mass
Especially the youth mass

The mainstream american youth.
They are not formal at all, they are rather pedestrian and ill-bred.

I know that there was always informal people, but even middle class families in the past were more formal than now.
They wore formal clothes, they had a formal way of speaking,

One needs only to look at photos in pre world war 2 America to see that nobody wore T shirts and Sports shoes all the time.

Why has America become this way?
Almost every country if you think about it.