Pope Benedict XVI has sent his first much-anticipated Twitter message using his personal account.
The Pope was shown pressing a button on an iPad tablet at the Vatican.
The message read: "Dear friends, I am pleased to get in touch with you through Twitter. Thank you for your generous response. I bless all of you from my heart."
A spokesman said earlier the pontiff would "reach out to everyone" with accounts in eight languages.
After his introductory tweet on Wednesday, Benedict posted two follow-up messages.
They focused on promoting the Church's recently launched Year of Faith - an initiative intended to re-energise Catholicism.
"How can we celebrate the Year of Faith better in our daily lives?" the pontiff asked.
And he answered: "By speaking with Jesus in prayer, listening to what he tells you in the Gospel and looking for him in those in need."
Benedict's English account already has more than 700,000 followers and is growing fast.
So far, the Pope's accounts @pontifex - which mean "pontiff" or "builder of bridges" - are only following each other.
Last year, the Pope sent his first tweet from a Vatican account to launch the Holy See's news information portal.
The leader of the world's 1.2 billion or so Roman Catholics is expected to sign off, rather than write, each individual tweet himself.
The Pope's tweets are also expected to highlight messages from his weekly general audience, Sunday blessings and homilies on key Church holidays as well as papal reaction to world events.
The Vatican has long shown interest in using the latest communications technologies to spread the faith with the inventor of radio, Guglielmo Marconi, setting up Vatican Radio in 1931.
The Catholic Church also already uses several social media platforms, including text messages and YouTube, to communicate with young people.
Papal aides say the pontiff himself still prefers to communicate in longhand rather than using a computer keyboard.
Pope Benedict's six-year papacy has been bedeviled by poor communications.
Embarrassing clarifications had to be issued over such thorny issues as his 2005 speech about Islam and violence, and his stance on condoms and HIV.