Forbes has published its list of 100 Most Powerful Women for 2012, with Angela Merkel on top, recognizing the achievements and contributions of women from all around the world. The list, edited by editor Mary Ellen Egan, is based on economic impact and visibility of leading women around the globe and all walks of life.

Facebook is initiating an advertising exchange that will let advertisers reach their target audience via the Facebook site.

Facebook Exchange will be a new revenue boosting measure for Facebook, one that is sure to parlay investor fears, to some extent; especially after the company’s turbulent Facebook IPO late last month.

Here’s how Facebook Exchange works: suppose you’re browsing a travel site to check flights to Heathrow but you don’t end up purchasing one.  The travel site can drop a cookie into your browser, and now, when you return to Facebook, you will be “retargeted” to see display ads for discounted tickets to London.