This is the first time since 1415 that a Pope has voluntarily stepped down from the post. The news is already trending on Twitter, with #Pope at No. 1, and #elpapadimite and #ratzinger in the next two spots. Benedict XVI's last tweet under the @Pontifex  handle was yesterday--his first was on December 12 --but has yet to comment on his decision via the micro-blogging network. Others, however, were not so slow.
Here's a spoof account from Number10Cat, resident feline at the British Prime Minister's residence.
The one-liner begat another one-liner, this time from a spoof Pope's account.
Pope Benedict XVI has resigned two months after joining Twitter; bloody trolls.— Larry the Cat (@Number10cat) February 11, 2013 
His Holiness will be signing off for the last time at 8 p.m. CET, on February 28, 2013, after which the Vatican will appoint a Conclave, the council which elects a new Bishop of Rome, one of the Pontiff's many titles.
Readying the lightning bolts. RT "@number10cat : Pope Benedict XVI has resigned two months after joining Twitter; bloody trolls.”— Benedict XVI (@PopularPope) February 11, 2013 
[Image via Twitter user Helen Lewis ]