How can i find out which of  my contacts do not use whatsapp?

I am using iPhone 5S on iOs 7.0.2
I am conducting an event where I want to send invitations to almost all my contacts.
Since there is daily limit on the number of Text Messages I can send out in a single day in my country, I want to segregate my contacts into people who use whatsapp and people who dont.
So, for whoever possible, I can send the invite via Whatsapp, and for the rest, I can send across a text message.
Any insights on how to do that..?
Thanks in advance.

I believed that the Whatsapp program looked at your contacts, and anyone already with Whatsapp info would show up in "favorites" under the Whatsapp program.  Is this not the case?  To do this, you would need to allow WhatsApp access to your Contacts.
Another thought:  Does Whatsapp info show up in the standard iPhone contacts?  If so, do you sync your contacts to iCloud, and have access to a PC?  On the OS X Contacts app (OS X 10.9.3), or in the web-based version of iCloud using a PC, I can type "twitter" or "gmail" in the search field, and it shows me all the contacts who have twitter accounts or gmail accounts.   After doing this, you could set up those contacts as a new group, so you
On my iPhone 5C using iOS 7.1.1, I can try and do the same thing in the search bar of the Contacts App; it works for "gmail", showing me folks having a gmail address, but not for "twitter".  
I have no experience with Whatsapp, however, this may not work, and would depend I guess on that info being something that shows up in the contacts list on your phone.
The answer to your question may be covered in WhatsApp's iPhone FAQ:
http://www.whatsapp.com/faq/en/iphone

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