Following the blast, certain accounts on microblogging site Sina Weibo and the instant messaging service WeChat began posting rumors like "toxic gas blown to Beijing", "malls and markets looted", and "no one survived within one kilometers of the blast site", state-run Xinhua news agency reported.
In addition, the Cyberspace Administration of China (CAC) said, some accounts masquerading as relatives of the victims, attempted to swindle money through fraudulent charity fund raising.
Some "big Vs", or star bloggers, had also posted "irresponsible" comments about the blast, according to the CAC.
The CAC has ordered social media enterprises to shut down more than 160 rumormongering accounts permanently, and to suspend over 200.
Two blasts at a warehouse in north China's Tianjin City on Wednesday night have left 56 dead and 721 hospitalised.