What is Facebook?

What is Facebook?  It doesn't seem like a big thing anymore but, quite recently I'm giving them a big thumbs up.  I can remember when I first got Facebook, it must have been back in grade 4 or so.  See things were different back then, you would use MSN and not Facebook Messenger.  A good majority of my friends don't even have Facebook installed on their phones anymore.  Not sure why, we all spent hours on it back in elementary school.  I guess Snapchat, Twitter, Instagram all have somewhat taken over Facebook.  See, Snapchat is like Facebook's Stickered app, you can send a "selfie" to a friend or multiple ones.  Twitter is similar to Facebook in the sense it is niche to just posting statuses, and Instagram is parallel to just posting pictures.  So I guess you could say that all of these big social networking apps saw Facebook's individual purposes and decided to focus down on just one.  What happened to Facebook Messenger?  Hangouts and iMessage were born.  Bringing this to a point I have broken my phone and at the moment using my brothers locked U.S. phone.  This means I can't just transfer my SIM card to his.  In order to communicate I must use FB Messenger.  And this is when it starts to get good.  See I suppose the board has decided to ban Facebook which I believe should be reversed.  Banning Facebook has made such an inconvenience for me.  My family and friends have Facebook Messenger so I can only communicate with them through that, but not at school.  I thank FB Messenger because it is acting as the main conduit to communicate.  Unfortunately, I am left frustrated becasue I am still unable to use it wherever with complimentary WiFi.