"Sentences, thoughts, spoons and the Internet etc, and works of art are determined by their context, a structure of meaning, whether we call it discourse, ideology or the structure of the trace, etc. They mean nothing outside of that."
If you think Heidegger said that, you usually say, "Ooh, that proves it. Thinking that way is already tantamount to Nazism."
If someone else says it, without acknowledging they are retweeting Heidegger, they are a cool kid.