Tony Robbins, an athletic 60 year-old with a quintessentially American square jaw, describes himself as “the nation’s number one life and business strategist”. He is the author of best-selling books such as Money: Master The Game and Unshakeable. Thousands attend his charismatic seminars around the world and tickets ranging in price from $695 to $2,995 are currently on sale for his three-and-a-half-day event, “Unleash the power within”, in Chicago in July. Now the global self-help star has issued proceedings in the High Court against Twitter, court records show. The case lodged on Thursday is the second one launched by Robbins…