Farid al-Atrash, the lawyer of Issa Amro, said Thursday that the court had extended his client's detention for four days.
He says Amro is being held under a recent edict that allows the government to crack down on social media critics.
In a Facebook post, Amro criticised the detention of a local journalist who called for Abbas' detention.
"This is a black day in the history of the Palestinian judicial system and for Palestinian freedom of expression," al-Atrash said.
Amro was detained on Monday and has been on a hunger strike since then.
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