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I vehemently disagree. I think it's good to "spread" ideas that you think are valuable, but without being a zealot/activist about it. On the contrary if you've stumbled upon some idea, philosophy, etc. that is valuable to you personally, and you decide to secretly keep it only to yourself, that seems a bit selfish.
I think a good first step is to reject browbeating, bullying, pile ons, and other tactics used to force ideas upon people. Another thing that needs to be rejected is the type of idea sharing that mainly generates heat (stokes outrage). So maybe in that sense I think "sharing memes" might be counter productive.
But sharing ideas, philosophies, etc. (religious, political, scientific, or otherwise) human-to-human at a personal level seems valuable to me - at the very least it keeps the marketplace of ideas (and therefore idea discovery) healthy without the heat of stoked outrage.