So I've just posted a comment on someone's Facebook page saying Congratulations. Someone beneath that has posted Congrats which then appears in an orange text, if you click or tap on it a set of balloons and confetti appears. I've tried with few different words including happy birthday and birthday but can't find any others. I know there was the recent thing of Hogwarts names for the Harry Potter anniversairy but that seems to have gone now - are there any others, or is there a list of them?
What are the context-sensitive clickable links on Facebook?
facebook;facebook timeline