system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why is twitter so popular? 

Everyone is talking about it, you even hear tweets mentioned on the news.  So whats so good about it?
gpt
Well, Twitter is a website where people can post what they're thinking, so long as it's short.  They can also post to it from their phones very easily, so it has become pretty common to post about what is happening around the person who is posting.  Sometimes people on Twitter see what's going to be in the news before the news people can get there, or sometimes they just say something really funny!  It can be pretty interesting to read.