You don't post in the typical INTP topic areas... or at least, I haven't noticed it if you have. You don't start threads focusing on the logical consistency of certain conceptual constructs. Nor are you ever prone to post with zero awareness of potential to offend.
I think you are ISFP.
When I think of you, the first strongest impression is that you have a strong inner decency which defines everything else about you (Fi).
My strongest impression of how you interact is that your fun is accessible, refined, experiential (ie. about experiencing something fresh, significant, ingenious, beautiful, etc.).. (Se).
You are definitely introverted intuitive, in that you are not shallow and that significant concepts influence all the preceding I've noted (Ni)... I put this in third place, because your conceptual activity is implicitly implied in your posts/activity, but usually isn't the principal topic of your threads (ie. You start threads with significant meaning, but they are not usually discussions of the concept itself).
Finally, I see a point to your activity... it isn't pointless, wandering experiential exploration. Your threads and posts create an environment of pleasant, experiential thoughtfulness. (Te). I place this fourth because I imagine you having something pleasant and meaningful to interact with... but then getting a little delayed by trying to find a way to implement it in a way that will work.
I like the conceptual diagram below, sans the term "sarcastic."