FYI – different than many other sites – you can’t see who liked a post. The author knows who liked their post but other people don’t. (As far as I can tell, at least. EDIT: This was incorrect. See the first reply below.)
Minor exception: You can see info on someone’s user page, e.g.:
For accounts with a low number of posts, e.g. a new anonymous account with one post, you could sometimes tell who liked something.