Hi there,
we are currently working on an analytics tool for crypto audiences.
Whenever a MetaMask user visit your websites, we will be able to know:
1. the Ethereum address of your visitor
2. How the user interact with your smart contract (click through rate, conversion rate...etc.)

other than that, we will be able to sum up:
1. how wealthy the visitor of your website is
2. what subjects your visitors are interested in.(by scanning history transaction records...etc)

We are now in private beta, if you would like to try it, please PM me with your email, website address..etc.
Thanks!