5 y ago
There was a time, in the not-too distant past, when the Internet was mostly about sharing educational information.

Sadly, the Internet is now full of companies who want to use it as a vehicle for advertising and who are obsessed with building up a dossier on as many people as possible, to exploit for financial gain. Your privacy means nothing to these companies; they will collect as much information about you as possible, with no regard for your wishes.

I take active countermeasures against these hostiles. I browse with javascript disabled. I don't have flash installed. I don't accept cookies blindly. I adjust my user agent. I run my own DNS server and cache and have hundreds of sites blackholed, including facebook, google analytics, and all the major ad servers.

It's some trouble to set all this up, and inconvenient at times. But unfortunately it's a jungle out there, and the default setup of browsers leaves you like a naked person in a mosquito-infested swamp.