I'm designing a business card for a client, and for the first time I'm going to use social media icons, such as Facebook/Instagram etc. I've been going through some of their guidelines and in the case of Instagram for example, they've stated the minimum size for the icon can be no smaller than 29px, which works out a little over 10mm. That seems like a ridiculously MASSIVE icon for a business card, to my eye anyway. I've looked at lots of cards on pinterest etc for comparisons and most cards that use icons seem to have them quite small...as in smaller than the styleguides suggest.
I'm wondering if anyone out there has designed a business card with social media icons and what sort of size did you make them? To my eye something more in the range of 5mm squared seems appropriate.