I got threema at launch for iOS. Still haven't managed to find anyone else using it unfortunately.

Same here. Threema sounds best on paper. I'm definitely going to try to use atleast within my family. But, I don't hope to have a thriving network around it any time soon.

Too bad the masses don't get the privacy angle in free products. I feel like FB<->WhatsApp is counting on just that by using a unintuitive "opt-out" policy. The moms,dads, and not so tech aware citizens won't even know what goes on underneath. They would be feeling falsely proud to use a 'secure','E-E encrypted' service not knowing 'privacy' is different from them.