Pope Francis

The pontiff has signed up for the photo-based social media site under the username "Franciscus."

In addition to Mother Teresa, four other Catholic figures — who lived in Argentina, Mexico, Sweden and Poland — will become saints this year.

Canonization is pricey: One journalist estimates half a million dollars is spent per candidate. Until now, it was spent with little oversight or documentation. Pope Francis is pushing to change that.

"The commandment, 'Thou shalt not kill,' has absolute value, and concerns both the innocent and the guilty," Pope Francis says.

Pope Francis was criticizing Republican presidential candidate Donald Trump's plan to build a wall on the U.S.-Mexico border. Trump called the comment "disgraceful."

The pope firmly ruled out abortion for pregnant women who fear effects of the Zika virus — but said that "in certain cases," contraception might be a lesser evil, without directly approving its use.

We all have comfort foods — even Pope Francis and the men who guard him. The Vatican Cookbook is a tour of life and food in the world's smallest country, as told by members of the Swiss Guard.

"Don't be selfish! Don't be selfish!" the pontiff said in Spanish, raising his hand to emphasize his point and call for patience.

The pope called out "a society of the few and for the few" during an open-air mass in the impoverished and violent Mexico City suburb of Ecatepec on Sunday.

Pope Francis and Russian Orthodox Patriarch Kirill met Friday in Havana. It's the first time leaders of the two churches have met since a schism 1,000 years ago divided Christianity.