Obama did not, however, directly mention his successor, President Donald Trump, who has made the use of Twitter a centerpiece of his presidency.
"All of us in leadership have to find ways to recreate a common space on the internet," he said. "One of the dangers of the internet is people can have entirely different realities. They can be just cocooned in information that reinforces their current biases."
Obama said he felt serene the day he left the White House at the end of his second four-year term despite the vast amount of work that remained unfinished.
He said it was "hugely liberating" to be able to set his own agenda in the morning to have the time to talk with his wife, Michelle, now that he is no longer president.
In a brief live segment at the end of the show, Harry said he did not know if Obama would be on the guest list for his wedding in May to American actress Meghan Markle.
"I don't know about that, we haven't even put the invite or the guest list together, who knows if he's going to be invited or not," Harry said. "I wouldn't want to ruin that surprise."
Harry did say his fiancee enjoyed her first Christmas with the royal family.
"The family loved having her there," Harry said.
The prince used his position to ask Obama a "lightning round" of questions of the type normally asked of entertainers, not politicians.
The former president declined to say whether he wears boxers or briefs, preserving a bit of post-presidential dignity, but was willing to say he prefers Aretha Franklin to Tina Turner "Aretha is the best," he said of the Queen of Soul and favours retired basketball star Michael Jordan over current phenom LeBron James.
He cited improved treatment of African-Americans and greatly expanded opportunities for young women as achievements of the past few generations that give him hope for the future. Harry also interviewed his father, Prince Charles, who offered a more downbeat assessment.
He said the root causes of climate change are not being addressed even as it caused "untold horrors" in different parts of the world.
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