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"trending topic" is correct and usable in written English.
You can use it to refer to a subject that is currently being discussed a lot, either in digital media or in real conversations. For example, "The COVID-19 pandemic has been a trending topic for the past year."
Exact(59)
Shortly after he punctured their advertisement, "Perrier" became a worldwide trending topic on Twitter.
Perez Hilton is STILL a worldwide trending topic on Twitter!
Upon release, '#LittleThingsOnVEVO' became the number-one trending topic worldwide on social networking website Twitter.
It's been a trending topic for weeks now.
More important, #HillarysHealth became a national trending topic on Twitter.
There are also campus-specific versions of the trending topic.
For a while "joy hop" was a trending topic.
It's a trending topic this year – the end has seldom been so nigh.
ITV said the debate hit the top trending topic worldwide on Twitter during the broadcast.
The night of the Globes, after Dinklage's mention, Henderson's name was a trending topic on Twitter.
Similar(1)
The premiere launch event of the single became Twitter worldwide trending-topic.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com