MarbleDice
[08] Mercenary
I can share combos, glitches, stuff like that...but mixups and applications...not happening.
Not sharing mix ups? If a mix up can be trivially defeated by knowledge of how to counter the individual options in the situation, then it's a gimmick, not a mix up. A mix up is when both players can know all options (rock, paper, scissors), and despite that, a failed guess leads to some kind of disadvantage for one player (damage, knock down, ring out, etc).
I think completely open sharing is more or less always good, but you do have to be careful about over-loading people with knowledge they can't use or don't care about. Not really a problem on a forum, but I've got a friend who'll go into specific strings, combos, and other applications in person way too fast to actually incorporate anything.