How to stop companies like Rapleaf from selling your personal info

Again Facebook is in the news for a privacy breach, but this time the culprits were top-ranked apps, including Farmville, Texas HoldEm Poker and Frontierville, which leaked Facebook users' personal IDs to advertisers. Personal IDs can be linked to a wealth of other information -- including name, age, where you live, social networks, income and interests -- that firms like Rapleaf sell to advertisers

The Wall Street Journal investigated and found out that Rapleaf had linked Facebook user IDs to other personal data and transmitted it to advertisers. Rapleaf claims that the sharing of the Facebook IDs was not done on purpose.