There are apps for this and Facebook can do it also. Find Wi-Fi spots on a map in the area or other areas before even visiting. Doesn’t seem to find all of them but good for a reference anyway.
What option is this in FB? But really to help with your one post no reply ratio 
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Umm, but don’t you need to have WiFi to find it?
otherwise it would be great for travellers not using roaming data.
(See, now Tango has a post with 2 replies!)
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It’s ‘free’ stuff button!
Thanks for the replies. I’m somebody now.