https://biketag.org/about says 'The game was originally found on /r/BikingATX' which leads to https://www.reddit.com/r/BikingATX/comments/1dhjbr/photo_tag/ which is 7 years old
I moved here almost two years ago from Philly where we used to play "photo tag" on our bike forum.
Looks as if they have Ludwigs in Philly, too:
After playing for a while in Philly people started coming up with some really obscure ones, ie. top of a parking garage at night and you could only make out a few lights in the background of the photo.
@jellybaby started
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https://biketag.org/about says 'The game was originally found on /r/BikingATX' which leads to https://www.reddit.com/r/BikingATX/comments/1dhjbr/photo_tag/ which is 7 years old