Some users who posted negative comments on BP's Facebook page in the aftermath of an oil spill in the Gulf of Mexico in 2010 say they were subsequently harassed or threatened by online "trolls" they believe were hired by BP or by the oil giant's PR company. The nonprofit group Government Accountability Project is investigating the allegations, and federal officials reportedly have asked BP to do more to rein in trollish behavior on its Facebook page.

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Al Jazeera

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