Memes are effective at making people feel less alone when they see memes they agree with, they're also funny and lift spirits, which as a leftist in this world is extremely important, memes definitely also play a part in radicalization, funny=relatable=something I want to be apart of.
I'm not a fan of blanket dismissal of everything online as useless or a waste of time, people spend their entire lives online now, this shit is crucial imo, but it isn't the same thing as organizing irl