My program finds recent posts with a lot of words and written by people matching a reputation filter. It sends them 0.001 SBD with the memo "a gift"
That happens roughly every 30 minutes.
People seem to like it.

The question isn't "what is spam?" but "what pleases people and what annoys them?"
My transactions are indeed a form of spam. But they please the people being spammed, instead of annoying them.