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Similar todos
allow user to only upvote once 
#plato
build upvoting system 
#shouldimakethis
Disable #diagram upvote button after click
1.0 (Upcoming version): Upvoting items works, without any user being able to upvote twice 
#securedfyi
1.0 (Upcoming version): Removing downvotes from items works, without any user being able to remove an upvote which isn't there #securedfyi
Beta (Upcoming version): Authorization required to undo item upvote #securedfyi
change upvote/downvote to save feature 
#archmaps
1.0 (Upcoming version): Removed loading on change in upvote count #securedfyi
improve upvoting UX by using ajax 
#wip
add/upvote downvote to 
#nomoregoogle
remove downvotes 
#captioncat cc @cbcamarao
upvote functionality 
#builtbyher
ignore votes from banned users #captioncat