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"Facebook's Recommendations Box sits passively on many websites, allowing us to engage or ignore as we see fit. But too much of the latter option has led to something slightly different: the new Recommendations Bar -- a pop-up variant which, when integrated by your favorite page, plugs site-specific links based on your friends' thumbs and shares. The Bar is similar to the in-house recommendation pop-ups we're all familiar with, but adds a like button for posting the current page to your timeline. It shouts much louder than the Box, so it's no surprise that in early tests the new plug-in produced a three-fold increase in click-throughs. In this case, privacy wasn't an afterthought -- Bar integration, like the Box, is at the site's discretion and sharing pages is very much on your terms. Just try not to accidently hit that like button during your daily scan of Bieber's homepage."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/07/27/facebook-recommendation-bar/>