[myth_buster]

Would just clicking on the "Like" button consider it as like or would the users have to hold press and select "Like"?

If someone has already selected "Wow", "Sad" or something similar, it perhaps would be useful to just click on the icon next to aggregation rather than doing the long-press behavior.

I suppose on the desktop site, perhaps mouseover may show the reactions.

I think overall it requires more effort on the user's part as opposed to just clicking on the like button and moving on. Which perhaps was the reason for the like button's initial success.

[eridius]

It's probably safe to assume that tapping the "Like" button will still like it, and you have to long-press to get reactions (since that's what the video seemed to show). On desktop, it's less clear what the appropriate interaction metaphor is; maybe hover shows you the other options, but clicking still just Likes it?