Analysis A growing number of business leaders and celebrities — e.g., Elon Musk, Jack Dorsey, Alex Ohanian and, most recently, Ricardo Salinas — have added the Bitcoin hashtag to their Twitter biographies. It hasn’t gone unnoticed. When Elon Musk added #Bitcoin to his bio in late January, Bitcoin soared by 20%. If indeed a succession of billionaires and tech moguls have taken the Bitcoin pledge — whatever that might entail — what is their motivation? Are they trying to manipulate the market, for instance — or promote their brand? Could they be just looking to pull the collectiv...