Comments and Testimonials on Profile 2 Profiles Is there a way of enabling either comments or a guestbook/testimonial functionality on Profile 2 Profiles? 

I've read discussions on here about implementing on User Account Pages but not for the Profile 2 Profiles module.

Any ideas?
There is a module called reply, that is intended as a solution for fieldable comments on non-node entities and should work with any entities created via the Entity API module, which includes profile2 entities.