If you get your news from this newspaper or our rival mainstream news sources, there’s probably a lot you don’t know.

You may not realize that our Kenyan-born Muslim president was plotting to serve a third term as our illegitimate president, by allowing Hillary Clinton to win and then indicting her; Pope Francis’ endorsement of Donald Trump helped avert the election-rigging.

You perhaps didn’t know that Clinton is a Satan worshipper at the center of “an international child enslavement and sex ring.” Or that Chelsea Clinton isn’t Bill Clinton’s daughter, but a love child of Hillary’s by another man — or that Bill has his own love child with a black prostitute.

Oh, the scoops we miss here at The Times!

None of those items is actually true, of course, but all have been reported by alt-right or fake news websites. And one takeaway from this astonishing presidential election is that fake news is gaining ground, empowering nuts and undermining our democracy.

I think we in the mainstream media — especially cable television — sometimes bungled coverage of Trump. There was too much uncritical television coverage of Donald J. Trump because he was good for ratings; then there was not enough investigation of his business dealings, racism and history of sexual assaults, and too much false equivalency that equated the two candidates as equally flawed.

Yet for all of our sins in the mainstream media, these alt-right websites are both far more pernicious and increasingly influential. President-elect Trump was, after all, propelled into politics partly as a champion of the lie that President Barack Obama was born abroad and ineligible for the White House.

Even now, only 44 percent of Republicans accept the reality that Obama was born in the U.S.

While the poisonous 2016 campaign is behind us, these alt-right websites will continue to spew misinformation that undermines tolerance and democracy.

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A BuzzFeed investigation found that of the Facebook posts it examined from three major right-wing websites, 38 percent were either false or a mixture of truth and falsehood. More discouraging, it was the lies that readers were particularly eager to share and thus profitable to publish.

Some of the people promoting these sites aren’t even conservatives; they’re foreign entrepreneurs trying to build websites that gain a large audience and thus advertising dollars.

Facebook has been a powerful platform to disseminate these lies. If people see many articles on their Facebook feed, shared by numerous conservative friends, all indicating that Hillary Clinton is about to be indicted for crimes she committed, they may believe it.

These sites were dubbed “alt-right” because they originally were an alternative to mainstream conservatism. Today they have morphed into the mainstream: After all, Steve Bannon, the head of Breitbart, one of these sites full of misinformation, ran Trump’s campaign.

It’s particularly troubling that alt-right sites agitate for racial hatred. Freedom Daily lately has had “trending now” headlines like “Black Lives Thug Rapes/Kills 69 y/o White Woman.” In fact, the killer was black but seems to have had no connection to the Black Lives Matter movement, and the murder happened in 2015.

There are also hyperpartisan left-wing websites with inaccuracies, but they are less prone to fabrication than the right-wing sites.

Rather, the problem with mainstream news sources is in part that we’re out of touch with many of the ordinary voters whom we purport to care about.

And one way in which we’re disconnected is that we don’t hear about or respond to these falsehoods in the alt-right orbit. I think that’s a mistake.

While the business model for mainstream journalism is in crisis, these alt-right websites expand as they monetize false “news” that promotes racism and undermines democracy. Worse, they have the imprimatur of the soon-to-be most powerful person in the world.