It seems I didn't frame my question properly, Mitakuuluu used to not automatically upload your contacts to Whatsapp to see who existed and who didn't, as far as I can tell Whatsup does.

1. Am I correct in this observation?

2. Can I control this very undesirable behavior?

As a side note it would be very much appreciated by people like me that this behavior was either mentioned as a warning in the pages explaining about the program or that before it does the act it asks "may I" and if the answer is "no" and it absolutely has to be "yes" to be able to function, quit the application.....