Still don't get it

I got a message asking me to log into my Gist account to keep.  I still don't get what problem that software is trying to solve. Very few of the people I deal with a professionally active on social media, and I'm not active on it.  I don't really care about most people's pets and trips to the farmers market. So, I won't be loggin in until I figure out what that service does for me.