Questionable experiments on mood manipulation aside, the juggernaut social networking site is testing a new feature aimed at keeping you on Facebook to do some shopping. Late last week it began testing a new “buy” button that will appear below posts advertising a product, allowing users to purchase directly from businesses without ever leaving Facebook. For now the test feature is limited to a select group of small- and medium-sized businesses in the US but we can all presumably look forward to friends’ latest purchases clogging up our news feed. Thanks Facebook.

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