Facebook comes loaded with features, which at times does make the user a bit confused. In most cases, the users lack complete knowledge about certain services and they really have a difficult time.
The news has come in limelight when Facebook users suddenly noticed about it after several weeks of removal. In http://www.apsense.com/article/no-more-tracking-of-friends-activity-on-facebook-ticker-is-no-more.html
you do not have to download anything new to be able to continue using WhatsApp.Regular users will continue to have full control over the messages they receive