in the beginning it will largely based on natural language of the context but once you opt in to redeem the tokens you receive from watching the ads, we lock your data into a smart contract that allows us to know in a safe and anonymous manner what type of ads you watch, what pages you visit so that the next time you visit a page, we show you content more likely that will be relevant to you. So you and your friend could visit that same page and hold down on a same line of text but see different ads.
It's the same as Google adsense, your browser is an open book and they can read it to deliver ads you interested in (damn, everytime I navigate I see ICO's ads everywhere). But again, you can always use Brave browser
You can also use different browsers for different thinks. One browser that is allowed to track you for Facebook, Vidy etc and other browsers for shopping, or banking.
Google will watch our activities once we sign in with our email address. Therefore google able to suggest us the rellevant news based on our previous activity. The question is, whether we have to keep sign in into vidy account if we want to get the benefit? Or is there any other method?