How to track changes to Twitter bios
TLDR — https://spoonbill.io/
It can be fun to see how your friends bios change over time. People will add what conferences they are going to, new cities they are in and it can be a good way to keep track of friends and start conversations.
I use https://spoonbill.io/ to see those changes. I get a daily email with the additions and subtractions.
Check it out.