Tesla/SpaceX boss Elon Musk has decided against joining Twitter’s board, the social media giant confirmed yesterday. Following revelations he had become the company’s largest shareholder last week, Twitter announced Musk would be appointed to the company’s board. But in an internal memo shared yesterday, Twitter boss Parag Agrawal said that Musk turned down the offer after “many discussions”, which he believes “is for the best”. While no reason was given for the decision, Agrawal said board members were expected to “act in the best interests of the company”, and Twitter will “remain open to [Musk’s] input”. That’s good news for the world’s richest person, who has advocated for changes, like an edit button. Next on his list: turning Twitter’s largely-deserted headquarters into a homeless shelter…