Although the social network is banned in the Middle Eastern country, it appears the country's officials can sign up, friend one another, and "like" each other's posts.
Both services were flowing to Iranian citizens on Monday, but officials there said the temporary reprieve was due to a technical glitch, according to The New York Times.
According to the Washington Post, the two social networks, largely dark in Iran since 2009, are once again available to some users.
The Twitter co-founder tweets a provocative question to Iran's president and gets a response that could mean a sign of change to come.
The Iranian minister of communication and information technology says the Web is unreliable because it is in the hands of "one or two specific countries." So Iran is making its own.
Symantec researchers report uncovering an earlier version of the computer virus -- one from 2005. The virus was later found to have inflicted damage on Iran's nuclear enrichment program.
Is Iran making real progress toward a full-fledged space program?
For a leader known for a thundering public presence, Iranian president Mahmoud Ahmadinejad's blog is not especially tough.
Two days in advance of Student Day, which marks the 1953 killing of students by Iranian police, the AFP reports that Internet access in Tehran is largely down due to "a decision by the authorities."