A few days ago, I was searching something on Google. Then I closed the Google app and then I just opened the Facebook app. I did not login to Facebook but just opened it. On opening, it showed a totally unknown page written in Bengali language instead of English. As far as I noticed, the Facebook page had the home icon on the lower right corner instead of usual left side and home icon had some notification number on it which is totally unexpected. The page I could find could not belong to my Facebook account. Then I closed the Facebook app and reopened it. This unknown page was no more there and then I saw my original Facebook account with normal newsfeed. What had happened actually? Do I have any possibilities of my Facebook being hacked?What should I do to get rid of this and prevent further problems?