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Saudi academic Ahmad bin Rashid bin Saeed al-Tamimi has been released one day after being called in for questioning by Mecca police, after the Saudi-owned news channel al-Arabiya took legal action against him.

Tamimi - widely known by his Twitter handle  - was released on Tuesday after being questioned about defamation charges the channel filed against him, sources close to the academic told °®Âþµº.

The professor of political communication is a long-time critic of the MBC media empire and its news channel al-Arabiya.

He shot to fame after his online campaign , which took aim at the network's "biased" news coverage. It garnered a huge pan-Arab following and hundreds of thousands of engagements.

On Sunday, Bin Rashid for a boycott of MBC and other "Zionist propaganda mouthpieces" in a series of tweets directed at the channel's chairman Waleed al-Ibrahim.

The Arabic-language hashtag gained traction on Twitter shortly after he was arrested.

Translation: "The legend of deconstructing Zionist narratives. Ahmad, your head will always be held up high."

Bin Rashid has amassed a cult-like following in Saudi Arabia and many other countries for being a vocal critic of al-Arabiya's coverage of Israel and despotic Arab regimes.

His high-profile led to a famous Saudi Ramadan comedy series on MBC, making a about him in 2013.