Social network Facebook is testing targeted advertisements on
user News Feeds as part of a broader plan to rake in additional
revenue.  The ads are part of Facebook Exchange, a system
businesses can use to deliver ads to users based on their
browsing interests.  The Exchange ads will look very similar to
content displayed on the News Feed from friends. Typically,
users would see ads in a Sponsored section to the right of the
page, in between the News Feed and Chat.  Facebook says the goal
is to deliver ads that are more relevant to users. "Allowing
advertisers to reach people in News Feed is important because
people spend more time in News Feed than any other part of
Facebook," reads a statement by Facebook.  The experiment is
part of a "small alpha test," so it's not clear how many users
will see these ads or when Facebook plans to roll this out to
all its users.  The testing takes place as Facebook searches for
more sources of revenue. The company is starting to see results,
posting a 41% jump in revenue du