If you’ve shown interest in the series or science fiction on the platform, you’ll see the new buttons replace the traditional set of reactions.
You might also see a personalized trekkie (or trekker, take your pick) greeting and will be able to set a custom Star Trek frame around your profile image.
I like Star Trek, but had never liked it on Facebook, so the new reactions didn’t show up for me. Thankfully, all I had to do was visit the series’ official Page and give it a like. Now I can Spock all the things.
Via The Verge