Reed Albergotti

The Internet has been simmering lately over privacy concerns surrounding Facebook’s Messenger app, which will soon become the only way mobile users can send and receive messages on the social network.

Some users were notified that they could no longer see or send messages unless they downloaded the app, and more users will get the same message in the weeks and months to come.

But amid the forced adoption of Messenger, some bloggers have cried foul over seemingly draconian permissions required for users of the Android version of the app. The bottom line is that, while some users might think it’s a drag to download a separate app for a feature that was once included in a single app, they’re not actually giving up a significant amount of additional privacy in the process.

A security researcher says he has discovered a potential privacy glitch in text-messaging service WhatsApp that occurs when users switch phone numbers. Xuyang Li, founder of TrustGo Mobile, says that when he downloaded WhatsApp, he inherited the account information of a woman named Jessica, the previous owner of Li's phone number. Li's WhatsApp messages appeared to recipients to be messages from Jessica -- complete with a profile photo of Jessica wearing a red scarf.

WhatsApp was lauded for its simplicity when Facebook agreed to acquire it in February 2014 for $19 billion. New users register only their phone numbers, and don't create usernames or passwords. Li's incident highlights how that simplicity might work against WhatsApp in this case.