A court in Kuwait sentenced a man to five years in prison on Sunday for insulting the emir on Twitter.
Society for Human Rights director Mohammad al-Humaidi said on Sunday that Mohammad Eid al-Ajmi received the maximim sentence.
Last month the same court sentenced two tweeters to two years each in jail each on the same charge.
In January, a court sentenced two men in separate cases to prison for insulting the emir on Twitter.
Ayyad al-Harbi and Rashed al-Enezi are in prison while awaiting appeal court rulings on their cases.
Humaidi says a large number of other youths are on trial on similar charges. More verdicts are expected in the coming weeks.
In recent months Kuwait has penalised several Twitter users for criticising the emir, who is described as "immune and inviolable" in the constitution.
Twitter is extremely popular in Kuwait (population: 3.7 million) and last year new legislation was passed aimed at regulating social media.