You'll drive yourself crackers trying to prevent website data registering. You can patiently clear the data, quit everything then the moment you load a browser, many have come back. I keep finding Twitter and Facebook and I don't and won't have anything to do with either.
It's almost as though they have done a deal with the browser people. Frankly, I would ignore them. After all, what can you do; stop browsing?
A well known contributor here wrote the following ...
Cookies have acquired a worse reputation than they deserve. They cannot hold any executable code, they just hold data and then, only data the user has provided. You could say they're as dangerous as you let them become.
And that I think sums it up. Clearing all website data is counter productive insofar as it removes many cookies that do a useful job and save you time.
Just take care where you browse, use private browsing if you are unsure and that should be enough. As an option, I bought an app called 'Cookie'. It's about £10 and I found it very good for a whole range of other cookies like databases and flash cookies. Read about it at ...
Thanks for the star.