Charles Xue Biqun, a famous Weibo celebrity known as Xue Manzi, posted bail pending trial on Wednesday, after being arrested for soliciting prostitutes in August 2013, Beijing police said.

Xue, 60, a prominent angel investor and microblogger with more than 12 million followers, left the detention center in Beijing's Chaoyang district after it was ruled he no longer posed a danger to the public. He is also ill, Beijing police said on its Weibo account Wednesday.

Xue's lawyer told The Beijing News that he has shown regret over what he has done. The case is still at investigation stage and has not been transferred to prosecutors yet, the lawyer said.

Chinese-American Xue has advocated for critical illness insurance in China, initiated a campaign to track down trafficked children and called for transparent details on pollution.

Xue was accused of group licentiousness for participating in group sex parties. He has been provided with consular assistance since his detention.