Former President Bill ClintonBill ClintonBill Clinton distributes relief supplies in Puerto Rico In Washington and Hollywood, principle is sad matter of timing Mika Brzezinski: Bill Clinton needs to apologize or stop talking MORE late Monday ribbed former President George W. Bush over the 43rd president's lack of a presence on Twitter.

Clinton used the hashtag #HowAreYouNotOnTwitter? in a Presidents Day message to Bush, President Obama and former Presidents George H.W. Bush and Jimmy Carter.

The message was retweeted by Obama's Twitter account.

Clinton was in Haiti with Clinton Foundation partners viewing agricultural and environmental projects.