More than a quarter of the world's population now uses Facebook every month, the social network says.
"As
of this morning, the Facebook community is now officially two billion
people," founder and chief executive Mark Zuckerberg posted.
The milestone comes just 13 years after the network was founded by Mr Zuckerberg when he was at Harvard.
He famously dropped out of the university after launching the global social-networking website.
The
internet giant announced it had one billion monthly users in October
2012, meaning it has doubled the number of its users in just under five
years.
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The firm's continuing growth will confound critics who have
long predicted that the social network's growth would slow down as
rivals such as Snapchat stole its users.
Earlier this year, Facebook warned that growth in advertising revenues would slow down.
Nonetheless, Mr Zuckerberg's ambitions remain huge.
He told USA Today the firm had not made "much fanfare" about hitting the two billion figure because "we still haven't connected everyone".
"What we really care about is being able to connect everyone," he said.
The firm's rapid growth has put pressure on its ability to moderate violent and illegal content posted on its site.
The most recent high profile incident involved a man in the US posting a video of himself to the site, showing him shooting and killing an elderly man.
Last month Facebook said it was hiring 3,000 extra people to moderate content on its site.
Italy's government is bailing out two banks in the Venice region at a cost of 5.2bn euros (£4.6bn; $5.8bn).
The
move comes two days after the European Central Bank warned that Banca
Popolare di Vicenza and Veneto Banca were failing or likely to fail.
The banks' "good" assets will be taken on by Intesa Sanpaolo banking group.
Italian
Prime Minister Paolo Gentiloni said the rescue was needed to protect
savers and ensure "the good health of our banking system".
The two
banks' branches and employees will be part of Intesa by Monday morning
in a move designed to avoid a potential run on deposits that could have
spread to other Italian banks.
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Economy Minister Pier Carlo Padoan said Rome would also offer
guarantees of up to 12bn euros for potential losses to Intesa from bad
and risky loans.
"Those who criticise us should say what a better
alternative would have been. I can't see it," he told a press conference
on Sunday.
Rome's plan has been approved by the European Commission and avoids a bailout under potentially tougher European rules.
The
EC's competition commissioner, Margrethe Vestager, said allowing Italy
to use state aid would "avoid an economic disturbance in the Veneto
region".
She added: "These measures will also remove 18bn euros in
non-performing loans from the Italian banking sector and contribute to
its consolidation."
Intesa, Italy's biggest retail bank, has paid a symbolic one euro for the two banks' good assets.
"Without
Intesa Sanpaolo's offer - the only significant one submitted at the
auction held by the government - the crisis of the two banks would have
had a serious impact on the whole Italian banking system," financial
analysts at Messina said.
The failure of the two Venetian banks could result in as many as 4,000 job losses, La Repubblica newspaper reported.
Bailout fund
Sunday's
rescue is the latest twist in the drive to fix the Italian banking
system, which is saddled with bad loans worth about 350bn euros - a
third of the eurozone's total bad debt.
In early June the European
Commission and the Italian government agreed a state bailout for Monte
dei Paschi di Siena (MPS) that included big cost cuts, losses for some
investors and a pay cap for its top executives.
The agreement followed months of talks over the fate
of the world's oldest bank and Italy's fourth-biggest lender - the
worst performer in last year's European stress tests.
Monte dei
Paschi was forced to ask for state aid in December 2016 to help cover a
capital shortfall of 8.8bn euros after investors declined to put more
funds into the troubled bank.
The same month Mr Gentiloni said his government had set up a 20bn euro fund - largely to bail out MPS.
Sunday's announcement comes less than a month after Spain's Banco Popular was rescued by Santander.
The European Central Bank said Banco Popular was "failing or likely to fail" due to its dwindling cash reserves.
The bank has struggled after billions in property investments turned sour.
The rescue will cost Santander about 7bn euros (£6.1bn).