This was his final tweet, and it is another example of the philanthropy that Hefner engaged in throughout his life.
Using his Playboy empire, Hefner founded the Hugh M. Hefner Foundation in 1964, with the aim of facilitating 'individual rights in a democratic society'. The fund provides grants to applicants between $5,000 and $10,000 USD.
Hefner also supported and donated to Children of the Night, a charity dedicated to rescuing children from prostitution.
A proponent of free speech, Hefner has also granted funds to groups such as the Student Press Law Center and the ACLU Foundation of Southern California.
Hefner also launched a Rational Sex and Drug and Policy program, which aims to 'advance a society where drug policies are grounded in science, compassion, health and human rights which promotes the sovereignty of individuals over their minds and bodies'.