hobbyDB maintains profiles on:

There are some specialized Facebook pages for Action Figures, Diecast, etc but we plan to merge them into the main page.  

There is also a general Facebook Group for the Squad plus Facebook Group for the Funko Squad.  The Hard Rock Cafe Pin Masters also have a Facebook Group that will be send to new Pin Master.

PopPriceGuide has these profiles:

and The Toy Peddler these: