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Back when FB release FB Instant, it increased my engagement with shared links significantly. Usually, on a phone browser, the thought of clicking on a link which would navigate away from the app and load a heavy full-fledged website would make me not want to click on shared links at all.

But with the lightning symbol next to Instant-supported links? Click right away. In the worst case, if the content is bad, you will back where you were in a second.

This is an interesting thought. Do you have any sources to back this up?

I think people share Facebook pages because they found the content on Facebook. Speed has nothing to do with it.