>can we buy gendy web browsing history
In this sad time that we live in… yes, yes it's totally feasible.
It's depends on who has the data, most likely microsoft, google or apple, sold it back to one of these companies:
http://cdn.chiefmartec.com/wp-content/uploads/2016/03/marketing_technology_landscape_2016_3000px.jpg

Part 4/4
Let me explain myself.
You must understand how copyright works in the first place.
When you produce data of any kind it belongs to you and only you.
But if a website (or a software) has a contract/term it overrides your copyright ownership of the data you produce and it give that ownership to the website (this one KYM is owned by cheezburger).
These contract consider that you have read them and accepted them (of course no on reads them but it's valid for the law)

I am not going to go any further on the said subject but I recommend you to take some time when possible and watch this conference:
https://media.ccc.de/v/33c3-8414-corporate_surveillance_digital_tracking_big_data_privacy
It explains a lot more than I could possibly do
there is also this image that I posted on the mastodon section (please don't use mastodon the creators of it are really bad people)
https://knowyourmeme.com/photos/1240847-mastodon