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By Dustin Volz WASHINGTON (Reuters) – Facebook Inc prohibited global users from coordinating person-to-person private sales of firearms on its online social network and its Instagram photo-sharing service on Friday, countering concerns that it was increasingly being used to circumvent background checks on gun purchases. U.S. President Barack Obama has urged social media companies to clamp down on gun sales organized on their platforms. It updates Facebook's regulated goods policy, introduced in March 2014, that banned people from selling marijuana, pharmaceuticals and illegal drugs.

Facebook has warned of heavy investments in 2015 as it steps up efforts to expand a collection of products that include messaging service WhatsApp, photo-sharing service Instagram and virtual reality headset maker Oculus Rift. As a result, Facebook's operating expenses rose 83 percent in the first quarter as R&D costs jumped 133 percent and marketing and sales spending nearly doubled. “The question is, can they keep costs under control and what will be the new revenue streams around video, Instagram and virtual reality around Oculus?” he said. Facebook's net income attributable to stockholders fell to $509 million, or 18 cents per share, in the three months ended March 31, from $639 million, or 25 cents per share, a year earlier.