It doesn't really clarify it at all but there is a question like this in their FAQs https://www.whatsapp.com/faq/general/28030012 about half way down or so.

Well, the latest trend is that you don't need an account to be tracked and spammed: https://news.ycombinator.com/item?id=12335168

If you use an app that displays ads from Facebook, then most probably yes.