As far as I'm concerned likes, favorites, etc. are Twinkies and actual comments are potatoes. Twinkies are tasty but not really satisfying (unless you have an unstoppable craving, but that's neither here nor there), but even a small potato makes your whole body happy (unless you really don't like potatoes, in which case just change the metaphor to an apple or carrots or a nice chunk of ham).

I like Twinkies every once in a while, so I do post some of my fic to dedicated archives and have a Facebook account where the people I grew up with can see I still exist, but for more useful feedback and online interactions I prefer the websites where the culture revolves around actually saying something (even if it's just "+1" or "this was awesome!" or "*hugs*") when you want to respond.