The 41st president, George H.W. Bush, has joined Twitter.

Bush, 89, used his first official tweet to offer his prayers for the family of the late South African President Nelson Mandela.

Barbara and I wish we could have joined the U.S. delegation honoring President Mandela today. He, and his countrymen, are in our prayers.

- George Bush (@GeorgeHWBush) December 10, 2013

Bush, who now uses a wheelchair to get around, was unable to join the official presidential delegation to South Africa for a memorial service today.

He is the latest former president to join the social media service. Former President Bill Clinton joined in April, and Hillary Clinton joined in June.

The White House's social media official welcomed Bush as well:

Welcome to Twitter, President @GeorgeHWBush! Can we look forward to a (Sock) Photo of the Day? pic.twitter.com/kegnkM1u4o

- Erin Lindsay (@Erin44) December 10, 2013