Android
Yes. The Samsung Galaxy S3 runs Android version 4.1
It is not. It had Samsung's proprietary OS with TouchWiz interface. More recent Samsung smartphones use Android OS integrated with a newer version of TouchWiz.
No, Samsung isn't Android, rather than Samsung use Android to power up their devices. What Samsung does is they download the Android Source Code, customize it according to their own way of showing things up and put it over their devices. I am sure you have heard about TouchWiz, it's the name given by Samsung own version of Android.
Some samples of Android phones are the HTC G1, Nexus One,Sony Ericsson Xperia X10a, Samsung Behold II, Motorola Cliq and many more.
Most Samsung handsets use the android system, but this would depend on the type of phone you choose. Samsung phones have very few models that are not android, but these would be very basic.
Samsung devices run on the Android operating system. While Apple's devices use iOS, Samsung's smartphones and tablets utilize Android, which is developed by Google. Samsung also customizes Android with its own user interface called One UI.
If it's an android Samsung then YES...I use mine on my kindle, fire tho
Android 4.0, overlayed with Samsung's own GUI.
Yes you can use a browser run version by searching "poppit android." Also there are poppit-esque games available in the app store.
Yes Samsung Ace has android Gingerbread. It can have Gtalk support in it. However now it is called as Google Hangouts.
Ginger bread