Spend time on social media or don't spend time on social media, you will regret it either way. This, gentlemen, is the essence of all philosophy.

Why would one regret not spending more time on social media?

I find that its easy to look back on memories and wish to go back. One day it clicked that I may look back on today and think the same thing. For me, the key is to try and be happy today, try not to look backwards and long for the impossible idea of revisiting those times, and try not to fear the future.