Is Disney preparing an offer to buy Twitter? Seems so, according to a Bloomberg report that says the entertainment giant has hired a financial adviser who’s exploring a possible bid for the embattled social network service. Twitter shares, which had been down, jumped 3.6% after the report. Others believed to be interested in the company include Salesforce.com and Google. Twitter CEO Jack Dorsey has been a member of the Disney board since 2013, and serves on its Governance…