WhatsApp adds biometric authentication for logging in on desktop   Biometric security on modern smartphones, the new system does not mean that WhatsApp is accessing or collecting your facial scans or fingerprints. Linking your WhatsApp account to your computer’s web browser or desktop app is getting a little more secure. Soon, if you’ve got biometric authentication enabled on your phone, you’ll have to unlock the app before you can link your account. The company says the new system is intended to ensure that should someone else gain access to your phone, they won’t be able to link your account to…