For example, WhatsApp restricted the number of times a user could forward something, and developed automated systems that detect and flag objectionable content. This ability to mix the public and the private, as well as the ability to use bots to engage with users has proved to be problematic. In early 2021, a database selling phone numbers pulled from Facebook was selling numbers for $20 per lookup. Similarly, security researchers found a network of deepfake bots on the platform that were generating images of people submitted by users to create non-consensual imagery, some of which involved children. Some privacy experts say Telegram is not secure enough Artem Kliuchnikov and his family fled Ukraine just days before the Russian invasion. In 2018, Russia banned Telegram although it reversed the prohibition two years later.
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