You must be talking about this thread, relating to his attack of Tim O'Reilly as a "Meme Hustler"
https://news.ycombinator.com/item?id=5472759
Well, I'll leave it to people to decide if the top commenter, potatolicious, was right in dismissing Morozov's piece as being too long. Frankly, that's the nicest thing you can say about Morozov's takedown, which confuses "length" with "substance", unfortunately.
This was O'Reilly's response, FWIW: https://plus.google.com/u/0/+TimOReilly/posts/Q8EqCQJstBE