A Vatican communication said that the Christian style should be reflective, not reactive, on social media.
Pope Francis has said previously that he wants to visit both Kyiv and Moscow on a peace mission.
The rule change grants voting rights for five religious sisters.
In Rome, Pope Francis led the Easter service at St. Peter's Basilica, decrying the "icy winds of war" and other injustices.
At least 70 died in the shipwreck off Italy's Calabrian coast.
Cardinal Pell, head of the Catholic Church in Australia, died Tuesday night in Rome aged 81.
The Vatican statement said Benedict was receiving constant medical attention and his condition was under control.
The Pope, celebrating the 10th Christmas of his pontificate, presided at a solemn Christmas Eve Mass in St. Peter's Basilica.
Together with evidence that a cardinal secretly recorded Pope Francis, they confirmed that a trial originally aimed at highlighting Francis' financial reforms has become a Pandora's Box of unintended revelations about Vatican vendettas and scheming.
A Vatican source said China declined an 'expression of availability' saying Xi had no free time.