So I have been thinking. (yes I can think) Metamask could actually become a very good anti-bot system that is used as a login source no matter what kind of site you are running of its a social network or a dating site.
Now talking about dating sites/app's they are filled with fake profiles that advertise cam sites and other sex like sites. If you made it a Dapp running on the Ethereum blockchain and use Metamask as the human verifier where after they have logged in to the site set a name, upload image and all that stuff that will be connected to the Metamask account.
With this, it will mean that you will be able to use the built-in browser in the mobile app of Metamask so people always will be able to get on to the site while they are away from home.
This is the idea, and I do not know if there actually are sites out there that use Metamask as a login for social networks or dating apps, but if you know any sites out there using it I would be nice to see them so feel free to list them down in the comments. Please do not list Dapps for gambling or games because I do not look after those I know use it.