Apud Iesum est verum gaudium

On Christmas Day His Holiness Pope Francis tweeted: "Apud Iesum est verum gaudium", which means something like: "With Jesus is the true joy."

Apud is a preposition which takes the accusative hence Iesum from Iesus.  When I looked it up I realised it would be easier to give some examples of its usage rather than a specific translation:

apud me  at my house

apud patres  in the time of our fathers

apud Ciceronem  in the works of Cicero

Tweetum facit

Pope Benedict's tweet in Latin inspired me to write a very short letter to three newspapers.  Unfortunately, none of them saw fit to publish it.  Anyway, the dead tree press' loss is the internet's gain, as here is the letter.

Salve,

Et in lingua Latina Pontifex tweetum facit.  Vivat lingua nobilissima.

Vale,

Naturally, Latin translations of Twitter and tweet are not easy to find, so I had to make one up myself.  tweetum is a tweet, and facit means he makes or does.  Thus tweetum facit means he makes a tweet, or more simplyt he tweets.

Pope Benedict's first tweet in Latin

Back in January, His Holiness Pope Benedict XVI added Latin to the list of languages in which he tweeted.  His first tweet in Latin was:

"Unitati christifidelium integre studentes quid iubet Dominus? Orare semper, iustitiam factitare, amare probitatem, humiles Secum ambulare."

Fortunately, the language is relatively simple.  Most of the words even I know, or at least I can make an educated guess.
  
You can read more about this on BBC News website Pope Benedict XVI posts first tweet in Latin.  Also, Harry Mount also discussed it on the Telegraph blog in his piece - The Pope's right - Latin is the perfect language for twitter