The girl surnamed Yang had initially claimed on microblogging platform Sina Weibo that her father was missing as a result of the blasts, which triggered a massive fireball in the northern port city, leaving 112 people dead and hundreds more hospitalised.
Yang -- who was detained by police in Fangchenggang in the southern region of Guangxi, far from Tianjin -- saw her Weibo follower numbers shoot up as a result of the post, Fangchenggang police said on their verified Weibo account.
Weibo has recently added a reward function, allowing users to transfer funds to others via its own platform, ostensibly to show appreciation.
Yang was unable to withdraw the funds, however, as her account was frozen after several Weibo users reported her as suspicious, police said.
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Though she was detained for allegedly defrauding users, a vast online censorship system operates in China and authorities have launched a wider crackdown against criticism of the disaster's handling and aftermath.
Critical posts on social media have also been blocked, with action taken against more than 360 social media accounts.