(on Wikipedia)
https://www.skype.com/

A ubiquitous VoIP, webcamming and instant messager client.

I only use Skype when other people need me to use it.

• Talking about a version is pretty pointless since it forces updates these days.

• Skype is not trustworthy

  • A while back (pre-Microsoft), Skype for Linux was caught reading the system's password file.
  • After purchasing Skype, Microsoft applied for a traffic-interception patent.

• Skype leaks one's IP address when making a call to contacts.