We like to compare ourselves with others, now add social media to the mix and you’ll be depress because some random people on friends list is/are now successful. For example I just logged in with my old account cause of family reason and boom! Everyone is now successful and you’ll end up comparing yourself with them.
That’s one of our problem, we’re a generation of comparison. There’s multiple solutions though, for me I logged out of Facebook, and focused on my Job, surround yourself with people that appreciate you, and just don’t compare yourself with anyone else. The later is hard to do, trust me on that.