Facebook makes changes to this algorithm frequently, at least every week, said Will Cathcart, News Feed product manager at Facebook.

FORBES: Facebook Clears The Air On News Feed, Promoted Posts

Other changes include improvements to the web feed, search engine and add-ons manager.

BBC: NEWS | Technology | Firefox browser for web 2.0 age

Over the past three months, a small team led by Daft Punk (Thomas Bangalter and Guy-Manuel de Homem-Christo) and manager Paul Hahn has orchestrated a drip-feed marketing campaign that has left almost everything about the album up to the imagination.

WSJ: Daft Punk's Stealth Start for a Summer Hit