I found out about this via @BBHLabs and it’s just one of a whole host of sites that are going to make Lists even more useful. We’ve barely scratched the surface I feel so watch this space.
Here you can build up a picture about someone and their interests just by the lists they’ve been added to on Twitter! Also quite handy is the similar lists that have been created by others on the right hand side.
To see what yours looks like add your twitter name to the end of this link.
So here’s what mine looks like:
It’s similar to Twittersheep which builds up a picture of the people who follow you. The above is simply a natural extension and an evolution in how people are using Twitter. The difference with MustExist is that it displays info about you, compared to Twittersheep which shows information about your followers. All still quite useful to build up a richer picture of a) how people perceive you and b) who is following you.