Pew Research Center report Facebook Algorithms and Personal Data claims that 74% of Facebook users did not know that Facebook catalogs their interests, hobbies, and such for the purposes of selling that information to advertisers. Half said they are uncomfortable with this. Personally, I’m amazed and shocked that the first number is as high as it is, and the second number so low.

Delete your Facebook accounts. Delete your Twitter accounts. You are their product.

Kaitlyn Tiffany’s take on this for Vox.
Xeni Jardin’s take for Boing Boing.