in my words that you have quoted i was trying to say that i found it difficult to communicate with my classmates when they had already made up their minds in the absence of evidence. it seems to me that you and i may agree on the fundamental issues but im not sure i understand your meaning. i cant obtain any degree of certainty that it is necessary for knowledge to be communicated or to be able to be communicated or formulated in language or to be externally apprehendable in any way at all in order for it to nevertheless represent a viable knowledge form within the internal world of any given person.
I think the thesis that all knowledge is social is taken in the sense of a tautological expression. Knowledge, in this sense, is any information that is communicable, i.e. communal (social).
In this way, it doesn't make sense to speak about 'incommunicable' information. Other than sensory experiences, our thoughts and internal dialogue is conducted in our native language and so we would be hard pressed to have a thought not communicable to another person.
I also don't believe physical sensations are included within the category of knowledge as we generally do not speak about learning how to feel pain or teaching how to feel pain. A memory of pain is communicable in the sense that you can describe it and communicate it to me and I can apprehend your meaning, but not in the sense that I can physically experience it concurrently with you.
Sensory information, I believe, is viewed in a two-fold manner. The senses operating autonomously and the implicit information that we process by them:
A sense is a physiological capacity of organisms that provides data for perception.
While tautological, I wouldn't hold it as an absolute truth. There are paradoxical, absurd, and liminal conceptions that are difficult to convey, but by which there is even less of an argument to make against the tautology due to the difficulty of describing them.