meme, highlighted, harbinger, holocaust, covert codes, memes & offensive humour

Since October 2018, at least 47 percent of them have been memes. They are highlighted here. The use of memes, Ms. Donovan said, is a way for Mr. Musk to signal to his followers that he is “in the know and keeping up with internet culture.”

Since then, Mr. Musk’s use of memes, which are highlighted, has accelerated.

UNESCO 

Holocaust denial & distortion harms us all. It spreads on social media through covert codes, memes & offensive humour. It is antisemitic, fuels homophobia, misogyny, racism & xenophobia. Discover UNESCO's latest publication: https://on.unesco.org/3AIQbzn #ProtectTheFacts

It is considered a harbinger of the Jewish holocaust.

Harbinger of doom

Meaning

A sign, warning of bad things to come.

Origin

We now use 'harbinger' in a metaphorical sense, meaning 'forerunner; announcer'. With that meaning, almost anything can be harbingered (the word has been used as a verb as well as a noun since the 17th century, although that usage is now rare). We sometimes hear of 'harbingers of Spring', or 'harbingers of day', but it is the 'harbingers of doom' that are by far the busiest in our present-day language.

harbinger noun [C] LITERARY someone or a thing that shows that something is going to happen soon, especially something bad: a harbinger of doom

meme

/miːm/

noun

1. 1.

   an image, video, piece of text, etc., typically humorous in nature, that is copied and spread rapidly by internet users, often with slight variations.

   "celebrity gossip and memes often originate on the site"
2. 2.

   an element of a culture or system of behaviour passed from one individual to another by imitation or other non-genetic means.

verb

1. create an internet meme from (an image, video, piece of text, etc.).

   "there's always one audience reaction shot at the Oscars that gets memed"

holocaust noun [C] 1 a very large amount of destruction, especially by fire or heat, or the killing of very large numbers of people: A nuclear holocaust (= destruction caused by nuclear weapons) would leave few survivors. 2 the Holocaust the killing of millions of Jews and others by the Nazis before and during the Second World War