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WhatsApp Lets Anyone With Your Phone Number See How Often You’re Online

There is a potential design flaw in WhatsApp that lets anyone with a WhatsApp account and access to your phone number (the one tied to your WhatsApp account) know just how much time you spend on WhatsApp. The flaw, depending on how avid a WhatsApp user you are, could also let someone estimate fairly accurately things like[…]

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How Facebook, Twitter, and LinkedIn Use Tooltips for Feature Discovery

Last winter, Facebook made a change that I’ll bet you remember. They updated their ‘Like’ button to include ‘love’ and ‘wow’ and other emotions. Facebook showed their users this through a simple, elegant user interface pattern called a tooltip:       Tooltips are a simple solution that are shaped to call out elements on[…]