Green thumbs and public red thumbs are currently used for the community Reputation/Karma system.
Private red thumbs are currently separate from the Reputation system (as far as I know), and only serves to prevent unwanted interactions with the private red thumbed players.
I suggest separating the private red thumbs from the public red thumbs into their own icon, and to make them usable without previous interactions (why are previous interactions required for private red thumbs?). Something like a yellow open palm, for the icon, or something seems appropriate.
This lets players see with a glance which kind of red thumb (in the current system) they have given, and should make it easier to correctly apply the desired red thumb on offending players.
Private red thumbs are currently separate from the Reputation system (as far as I know), and only serves to prevent unwanted interactions with the private red thumbed players.
I suggest separating the private red thumbs from the public red thumbs into their own icon, and to make them usable without previous interactions (why are previous interactions required for private red thumbs?). Something like a yellow open palm, for the icon, or something seems appropriate.
This lets players see with a glance which kind of red thumb (in the current system) they have given, and should make it easier to correctly apply the desired red thumb on offending players.
