The act of killing memes, the most well known case of memecide which is still going on to this day is pewdiepie'e "meme review"
PewDiePie: I'm going to commit memecide
Everyone: NO LET IT LIVE AT LEAST A DAY
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when you overdoes on pure uncut memes
Trent: I am going to commit Memecide!
James: Fuck off trent.
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The complete eradication of an idea, behavior, belief or ideology from the public consciousness, to the point where it can no longer be taught to new people. "To kill an idea".
Although banning Holocaust denial from social media platforms will likely reduce the influence of that particular toxic idea, as long as people are still able to discuss it in private or public forums, it is a far cry from true memecide.