Radha Stirling of Detained in Dubai on Laleh Sharavesh & UAE Cybercrime Laws
Under the UAE's cyber-crime laws, a person can be jailed or fined for making defamatory statements on social media.
Ms Shahravesh was married to her ex-husband for 18 years, during which time she lived in the United Arab Emirates for eight months, according to the campaign group Detained in Dubai.
While she returned to the UK with her daughter, her husband stayed in the United Arab Emirates, and the couple got divorced.
Ms Shahravesh discovered her ex-husband was remarrying when she saw photos of the new couple on Facebook.
She posted two comments in Farsi, including one that said: "I hope you go under the ground you idiot. Damn you. You left me for this horse".
Under the UAE's cyber-crime laws, a person can be jailed or fined for making defamatory statements on social media.
Detained in Dubai said Ms Shahravesh could be sentenced to up to two years in prison or fined £50,000, despite the 55-year-old writing the Facebook posts while in the UK.
The organisation said Ms Shahravesh's ex-husband's new wife, who lives in Dubai, reported the comments.
It said Ms Shahravesh and her daughter flew to the UAE on 10 March to attend the funeral of their husband and father, who had died of a heart attack.
At the time of her arrest, Ms Shahravesh was with her 14-year-old daughter, who later had to fly home on her own, it added.