I've actually never 'liked' a post- I always prefer to leave a comment as I think a 'like' doesn't quite express the joy/shock/interest I get from reading someone's post and I like to express that in words! :) I like getting 'likes' myself of course, but I can never really seem to break myself into doing it back- my mind is actually really restrictive in the things I can do so 'liking' isn't one of them... if I did it for one, I'd have to go back and do all the others I have ever liked! It would have be a literal liking rather than a half-hearted click that takes half a second... so it's much better for me to leave a comment to express more clearly that I have read the post and about how much I've enjoyed it :) Accursed brain! *shakes fist*
But more to the topic, I haven't actually had any posts without likes on them, but then again I am quite a new blogger and the feature was already here when I joined. The lowest likes I've had though were for my first post and also for 'Bird Seed' which each got three likes each. My highest, on the other hand, is 'The Trains' with 12.
I do appreciate people's likes and I hope I don't offend anyone by not liking them back- but my general OCD and whatnot actually totally prevents any likeages whatsoever. It's one of those bizarre quirks that's helped to make the Insanity Aquarium quite this insane, however... so it's probably a good thing too :D