All you need to know about Signal App and why it's better than WhatsApp Tesla CEO Elon Musk issued a call to 'Use Signal' to his millions of Twitter followers. Musk tweeted that he uses Signal App and not WhatsApp. (Image Source: Mobile App Daily) Share Updated: Jan 9, 2021, 09:20 PM IST Instant messaging app, WhatsApp has been very popular amongst its users over the years. However, with change in its privacy policy which elaborates more on the data sharing with Facebook, users are contemplating shifting to other messaging apps. Amid all this, world's richest man, Tesla CEO Elon Musk issued a call to 'Use Signal' to his millions of Twitter followers. Musk tweeted that he uses Signal App and not WhatsApp for messaging. After Elon Musk's tweet people are continuously downloading the Signal App. Currently, the app is topping charts.