Snapchat has launched a feature that enables up to 16 people to take part in a live chat together, using either video or just their voices. The app's members can also start tagging each other by username, using the @ symbol in their posts. The changes will roll out over the coming weeks, the firm said. Snapchat came under fire for a recent redesign. A petition calling for the changes to be reversed attracted more than 1.2 million signatures. At the weekend, Snapchat's first TV advert aired in the US. Observers noted that it seemed to strike a family-friendly chord. "Snapchat's early growth has been largely been built on attracting a strong youth-centric audience," commented Jack Kent from IHS Markit consultancy...

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