In Iran, internet users had direct access to social networks for the first time in four years. But it was a brief experience with the blocks restored by the authorities within 24 hours.
An official from the board which oversees the internet in the country said the access was down to a “technical glitch” which had been rectified.
The move has led to several theories including one which says what happened points to increasing internal differences between the hard-liners who want to remain in control of the internet access and groups who want sites like Facebook re-opened.
Others believed it was a result of policies by newly elected President Hasan Rohani who has pledged more openness in Iran.
Some politicians in the country have their own Facebook pages though there have been disputes as to their authenticity.
Iran has blocked Facebook and other social network networks after they were widely used by opposition supporters during the disputed 2009 re-election of former President Mahmoud Ahmadinejad.