I mean the concept of being tickled and asking the tickled to repeatedly stop, first jokingly then serious, is a common theme and concept which has been reenacted across all manner of social media including vine, tik tok, YouTube, and so on. If anything, a celebrity liking this tells me they dont really like being tickled and can relate to asking someone to stop.
And I guess it really depends. As silly as this sounds, do we know for a fact that the celebrity is actually the one running their own socials? Or are they maybe paying or hiring someone to work their socials for them?
Other than that, I don't really care too much. Although I guess it depends on the celebrity as well and the amount of information we have available on them. Take Taylor Swift for example. We literally know nothing about her and her ticklishness. She has never admitted to anything and has never been caught being tickled. For that reason, I'm dying to know. If she were to like a post that's like "omg I'm so ticklish" or "pedicures really tickle" or something like that, yeah. I would probably get excited.