I don't know much about owning or managing a Yuku group, but I'm wondering if, if asked, Yuku could change the chat site to allow for larger fonts. 

Considering that people with diabetes often have vision problems of one sort or another, the ability to post in larger font and bold print would certainly facilitate reading.  Also, not having to click on "bold" and "font size" (should it become available) each time would be beneficial.

Jak