How do I find out which hashtags are trending on Facebook?

I never searched for and posted using trending hashtags; I only use hashtags I come up with myself or hashtags relevant to the content of my post

Elmago13 said:

Is there a website or function where I can see this? I've noticed that writing about trending topics helps my website go viral.

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i would not rely only on a tool that identifies trending hashtags. search for ur niche on facebook nd observe the hashtags that constantly appear in the posts that generrate high levels of engagement. afterward check the same topic on google trends. sometimes it is the topic not the hashtag, that is driving the surge..

Facebook doesn’t make trending hashtags very easy to track. I’d search the topic on Facebook itself and see what tags keep showing up in recent posts.

Google Trends can help too if you’re mainly trying to catch topics that are starting to move.

I usually check the hashtags used on similar posts first. Facebook search also gives a decent idea of what people are using.