WhatsApp is expanding where and how you can add and update your contacts list, with a goal of eventually allowing you to add new contacts using a username without needing a phone number. In a Tuesday blog post , WhatsApp said that initially the chat app will allow for updating your contacts list from the service's web and Windows applications, with plans to expand to other linked devices later. Currently, contacts have to be managed using the primary phone that a WhatsApp account is set up...
