Hello: I'm on the board of directors of the nonprofit PlanetMath.org, and I'm doing my Ph. D. at the UK's Open University on the topic of "Peer Supported Problem Solving and Mathematical Knowledge". We've built a lot of new features into PlanetMath and I'd be interested to see how people who are used to the features of math.stackexchange.com feel about them.
I don't want to spam your site though, so I'm asking here if there as a way to appropriate way to advertise my need for study participants without being spammy.
For the record: I only need 3 people to form a small focus group, and I have $50 USD, or £36 GBP vouchers to offer. Other details on the study are here.
Note that this message itself is not intended to be "spam" -- the details are just here for you to evaluate my request. My own hypothesis is that maybe I should post about this in the chat. Other ideas?