Although it's still entirely possible for the name to mean absolutely nothing to you, there's a good chance that you've at least heard the name QAnon in passing by now.
As the BBC reported, this refers to the followers of an anonymous person who has claimed to hold a high level of security clearance within the U.S. government that they call "Q Clearance." Since October 2017, this person has claimed that both the Democratic Party and various Hollywood celebrities are a part of a cabal of Satan-worshipping pedophiles that President Donald Trump is waging a secret war against.
These followers number in the thousands, have spread across all social media platforms, and have since developed their own iconography and slogans, the most well-known of which being "Where we go one we go all" or "WWG1WGA."
In addition to this main claim Q has made, they essentially tie major events in recent history such as the COVID-19 pandemic and Special Counsel Robert Mueller's report that informed Trump's impeachment to these supposed secret wars. This has not only resulted in the spread of coronavirus misinformation but also harrassment campaigns and credible threats of violence.
And now, Facebook has decided they've had enough of all things QAnon.