Shoot, I wave at every two wheeler when it's safe. I'm like Forrest Gump seeing Lt. Dan for the first time in years!
I also use the parallel twin finger wave (finger wave!!!, where's my proctologist?) No, the index finger and middle finger stuck together is what I mean by that.
And if they don't wave, I know that they "just don't get it" - probably a poser.
Wave Safe,
Dennis