A group of Iranian Twitter users are writing political slogans on banknotes, and using them to spread protest messages.
What it means: In December last year, protestors took to the streets of Iran's capital, Tehran, to protest against the government. Most of the protests were organised through a messaging app, called Telegram. The app's now being threatened with closure. In fact, in Iran, Twitter is also banned (though leaders have accounts, and some people access it through a 'proxy' server).
Iranians have found a novel way of getting round the censorship. They're writing protest slogans (similar to the ones shouted at the protests in December) on banknotes. Banknotes circulate really fast – they go through a lot of different people in a short space of time. It's difficult to know who's come into contact with one, and you can't really stop them from circulating, because you'd be halting economic activity, which no-one likes to do.
"Banknotes are our un-censorable messengers", one Twitter user wrote.
