Free speech campaigners in Tunisia are using the internet to highlight the plight of several bloggers and one musician who have been arrested amid a wave of anti-government protests.
Those detained are reportedly being questioned by police over the alleged hacking of government websites.
More demonstrations have been reported over the economy and repression by the authorities.
One blogger, Slim Amamou, went missing on Thursday after tweeting that police had surrounded his house.
According to the website Nawaat, his mobile revealed that he was being held at the Interior Ministry. Amamou is one of the country’s best known bloggers campaigning for free speech.
At least four people are said to have died since the protests began last month. Trouble flared again this week following the death of a young man who had set himself alight.
The government in Tunis has accused opponents of exploiting the unrest.