By Luc Olinga Less than forty-eight hours after disclosing his stake, Elon Musk already has plans for the micro-blogging website. Elon Musk, CEO of Tesla (TSLA) – Get Tesla Inc Report, had promised that he would be a passive shareholder at Twitter (TWTR) – Get Twitter, Inc. Report. Unlike activist investors like the legendary Carl Icahn, he has pledged not to influence those who control the platform, but just hours later that pledge seems to be a thing of the past. The billionaire, who became the group’s largest shareholder with a 9.2% stake, was invited to the board of directors at the same t…