I was happy. I was joyful. I thought the meta keywords tag had finally died last year. But Bing recently said that it does use it. After some back-and-forth, I can confirm further that it does, but as a signal for finding spammers, not for improving rank.
Meta Keywords Tag 101
If you want the history of the meta keywords tag, how it emerged, how it declined, how to use it if you stupidly decide you still want to, see my detailed post from the past, Meta Keywords Tag 101: How To "Legally" Hide Words On Your Pages For Search Engines.
Surprise! Bing Says Meta Keywords Is A Signal
But really, [...]
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