SANTIAGO, Cuba- In his final formal event in Cuba, the pope has called on Cubans to strengthen the bonds of family, which he calls "true spaces of freedom."

He says the breakup of families fragments societies or makes them uniform. He says that in both cases, "people turn into isolated individuals, easy to manipulate and to rule."

After the remarks at the Cathedral of Santiago, he's heading to catch a flight to Washington to begin the U.S. leg of his trip.

Twitter rolled out special emojis for users tweeting about Pope Francis' visit to the United States. Tweets with the hashtag "PopeInUS" render an icon of a smiling, white-capped pontiff in front of a U.S. flag.

There are also emojis for #PopeInDC - the U.S. Capitol; #PopeInNYC - the Statue of Liberty; and #PopeInPhilly - the Liberty Bell.