Michael Phelps made history yesterday, breaking the mark for most medals ever won at the Olympics.
And it didn't take long for the legendary swinner to receive congratulations from another record-setter, the nation's first-ever African-American President.
"Congrats to Michael Phelps for breaking the all-time medal record," Barack Obama Tweeted. "You've made your country proud."
Phelps soon replied to the First Message with: "Thank you Mr. President!! It's an honor representing the #USA!! The best country in the world!!"
Of course, Missy Franklin received props from Justin Bieber after she won Gold earlier in the Games, prompting the difficult question: From whom would you prefer to receive a Tweet?