The Ticker: Yahoo & Flickr; GM quits Facebook ads; Social media & sex; Facebook IPO (again); Bush’s Romney endorsement

Gizmodo: How Yahoo Killed Flickr and Lost the Internet

Wall Street Journal: GM Says Facebook Ads Don’t Pay Off

Global Post: Social media offers sex-like brain reward, says study

Huffington Post: Facebook IPO Swells Again What’s Behind George W. Bush’s Odd Romney Endorsement?