ChefMoz lists restaurants, cafes and bars. You can browse for what you're looking for by cuisine, rating or location and then you can come back and provide a rating and review. Or you can upload new places you come across. It also links to selected reviews and online resources.
The sections for Chiang Mai, Bangkok and Phuket are the most active.
chefmoz.org/Thailand/Chiang_Mai/
...and other cities in Southeast Asia
Send your feedback or queries to been.there@guardian.co.uk
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