Chinese authorities have launched a campaign to "eliminate" malpractice on instant messaging services.They allege that some people have used such services "to distribute illegal and harmful information, seriously undermining public interests".China has said suspects arrested in recent anti-terror sweeps shared their knowledge of making explosives via chat services and text messages.Instant messaging apps have become hugely popular in China.One of the biggest ones, WeChat, boasts more than 800 million users.Over the past few years social media platforms have gained popularity among Chinese internet users keen to voice their opinions and share unfiltered information.However, this has resulted in increased scrutiny and censorship Bakudaily.az