WHY?
Because you can use steemit as Facebook, twitter, instagram or Reddit. It has enough features to compute with any of them.
WHY WILL STEEMIT REPLACE THEM?
It's kind of obvious. MONEY. So as we all know, steemit users can get paid for good and original content unlike any other social media sites.
The beauty of steemit is the blockchain and the cryptocurrency which is connected to it. The popularity of cryptocurrencies have increased tremendously in the past years and it's starting to be used by a lot of brands and companies world wide.
So invite your friends, make good content and lay back waiting for the Big Bang to happen on steemit!