The niche social media company just silenced the bears. Pinterest's (PINS 0.58%) stock surged 21% on May 1 after the social media company posted its first quarter earnings report. Its revenue rose 23% year over year to $740 million, exceeding analysts' estimates by$40 million, while its adjusted earnings surged 150% to $0.20 per share and cleared the consensus forecast by seven cents. Pinterest's headline numbers were impressive, but does its stock still have room to run after rallying 90% over the past 12 ...