Images and news are being updated to their Facebook page. (Source of image above, of Pontifical Vespers celebrated yesterday.)
You can also use their hashtag to find pilgrims posting images and news on Twitter.
In just a few hours, remember, a Pontifical High Mass with Cardinal Pell at Santissima Trinità dei Pellegrini. (UPDATE: According to Messa in Latino, Cardinal Pell was unable to celebrate the Pontifical Mass due to sudden illness; a Solemn Mass was instead celebrated by his personal secretary. A homily written by Cardinal Pell and a message from Benedict XVI, who told the pilgrims that "I am with you in spirit", were read out at the Mass.)