No, but you probably have acted on it without realizing. Have you ever given food or money to a homeless person? To me, this is a quintessential "this person might have the soul of a communist" action that your average person can do (and would presumably feel compelled to do) without having an organization backing them, or without strong theoretical knowledge, etc.

As people are also saying, you can consider posting to be a form of propaganda, although I personally get a "bullshit cope-ass shit" vibe from that line. Like, I can't really disagree, insofar as it has to be better to just have those ideas and sentiments out there at all rather than not, but I dunno dawg, a lot of people's posts actually suck ass and aren't what I would consider good propaganda (mine too, just saying), and posting is just so fucking lame that I don't want to give it much credit I guess.