Twitter's Dick Costolo to step down amid stalled growth and troll troubles

Co-founder Jack Dorsey to take over as interim chief executiveCostolo had faced controversies including piracy and online abuseThe outspoken Twitter chief executive Dick Costolo will step down in July, the company’s top brass said on Thursday, even as he insisted the sudden departure – which arrived after years of stalled user growth and amid a storm of controversy – was his own decision.Related: Twitter CEO: We suck at dealing with trolls and abuseContinue reading...