For starters, it's true that a visit to a news story or watching a video will trigger a feed story. The point that most people seem to be missing is that this requires you to knowingly allow a social application. For example, in my case, I installed the social plugin for rdio (rdio.com). When I listen to a song on rdio, it publishes it to my friends ticker feeds. (Ticker is the bar on the side where likes, listens, reads, etc go). There are a couple websites that are doing read social browsing, for example the Washington Post's social reader (https://apps.facebook.com/wpsocialreader/). Again, just by visiting this page you will not trigger anything unless you have already allowed the application access.
In the past I've setup my music player on the laptop to publish the songs I'd been listening to, to my IM client (as away messages) - Adium let's me do this out of the box. It's kind of the same idea, instead this is just built in to the website you visit or music you listen to.
You can also disable any application you previously installed by going to Privacy Settings and clicking on Apps and Websites. It should all be there. You don't have to log out of facebook or close your account. Just delete all your social apps. (https://www.facebook.com/settings/?tab=privacy)