Facebook Makes Big Change to News Feed

[f500link]Facebook[/f500link], the world's largest social network, is constantly engaged in an algorithmic balancing act. The mathematical calisthenics serve just one purpose: Keeping you, me, and Facebook's other 1.65 billion users coming back for more. After all, every time we visit, Facebook gets another fraction of a cent in advertising revenue. Pretty soon, that adds up to real money — $5.2 billion in the most recent quarter.