Authorities said the deadly siege at an upmarket cafe popular with foreigners had been an "eye-opener", exposing the role of social media in recruiting young men to jihadist groups.
"Social media has become a fertile ground for recruiting militants," the head of the telecoms regulator Shahjahan Mahmood told AFP.
"The attack was an eye-opener for us. They (jihadist groups) attract the young men through social media."
Mahmood said the Bangladesh Telecommunications Regulatory Commission (BTRC) had ordered YouTube to remove videos of "radical preachings", including those of the firebrand cleric Jashim Uddin Rahmani.
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He was sentenced to five years in jail last December after his speeches were found to have incited Islamist militants to kill the atheist blogger Ahmed Rajib Haider in early 2013.
Shortly after the cafe siege, it emerged that several of the Bangladesh attackers were young, tech-savvy men from wealthy families and had easy access to social media.
Imtiaz reportedly posted an appeal on Facebook last year urging all Muslims to become terrorists and quoting a controversial Indian preacher who has been banned in Britain, Canada and Malaysia.
"He was a practising Muslim. So many people are. Maybe he was radicalised through the internet," his father Imtiaz Khan Babul told AFP.
"But I never checked what he was browsing... Someone may have brainwashed him."
Bangladesh police issued a stern warning Wednesday that anyone caught sharing jihadist propaganda online would be punished in the wake of the unprecedented attack in Dhaka.
"If anyone is found to have engaged in such activities, tough legal action will be taken against that person.