Weibo Corp., the Chinese social-media service akin to Twitter Inc., is probably running out of steam after rallying 41 percent this year, according to traders and analysts. Short interest has surged to a seven-month high of 2.4 million shares, and brokerages on average forecast a 7.7 percent drop over the next 12 months, data compiled by Markit Ltd. and Bloomberg show. The U.S.-traded stock sells for 38 times projected earnings, exceeding the average of 10 global peers, including Facebook Inc.

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