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Often hear pilots flying formation "X flight, go 123.45," even though that frequency is not approved domestically for that use. I hardly ever hear chatter on the approved air-to-air frequency.
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what are you smoking!?!?!?!? how do you not hear chatter on the air-to-air freq, especially 122.75!?!? that freq, at least in and around Ohio is one of the busiest with air-to-air chat, none of it very important sometimes downright funny, but there's always someone on it!
and I'm pretty sure 123.45 is approved, I'd have to double check but at least at the two flight schools I've worked with they list that along with 122.75 as air-to-air
as for 121.5 I know it triggers alarms in some towers when it's used in any way shape or form.