Hi friends I am using OPPO neo7 with 1GB RAM, I thing that is enough for using facebook App. But facebook App occupied really big space in phone memory. When you install then app data size automatically increased. Therefore your device space decrease. Not only that it has another problem for reading and sending massage in facebook. You can’t read or write any massage to your friend if you don’t install messenger app of facebook. This messenger app data size near about 179MB in my phone. Now you can imagine how much space facebook occupied in my phone. And this facebook messenger app only for reading and sending massage, some time for video calling but it’s depend on phone. So if you want to do anything in facebook, you have to install both app and both are really big file.