Well if you call it flying_sweatdrop, chances are someone down the line is going to apply to have it implicated to sweatdrop. It would be good to get a concrete explanation of their purpose to show people it's different. It seems to me almost as if they're a milder version of /\/\/\, although I still think they are sweatdrops. post #1006972 also has them.
They're nothing like /\/\/\. That's used for shock or surprise, a sharp moment when something is realized or noticed.
These sweatdrops are used more like a sign of being nervous or uneasy. The character Cyberia-Mix linked, Sakurai Izumi, has them at practically all times, being an extremely nervous and uneasy character.
It's pretty similar to sweatdrop, but it's visually distinct from it, which should probably qualify it for it's own tag. I don't think an implication to sweat drop would hurt much, though.
sweatdrop, the figurative way (blue drop), is basically an emote telling that the character thinks a situation is stupid or bothersome,
sweatdrop, the literal and less common way, expresses nervousness or fear (also tagged sweat when heavy), or also used when there's no purpose at all and we just assume it's sweat rather than water,
encountered this finally and would it be better if the tag is flying_sweatdrops instead since there are usually at least a pair of it and in uniformity with flying_teardrops. thanks.
sweatdrop, the figurative way (blue drop), is basically an emote telling that the character thinks a situation is stupid or bothersome,
sweatdrop, the literal and less common way, expresses nervousness or fear (also tagged sweat when heavy), or also used when there's no purpose at all and we just assume it's sweat rather than water
IMO, sweatdrop should only be used for the former. Anything else (regardless of how heavy) should be sweat.
I think the realistic sweatdrop you see for example when a character is caught red handed doing something bad is somewhat closer to the purpose of the blue drop than sweat you get from heat, effort, fear, etc.