Yeah, agreed. While there are gray areas in the definition, and I can certainly waste an absolute shitload of time on HN and Reddit, both of those sites allow anonymity, and neither provide user-specific personalization (with Reddit you can obviously choose to subscribe to certain subreddits, but that's not done for you, and AFAIK everyone gets the same view and order of stories and comments). What you see in the future is not just inferred from what you clicked on in the past, and that for me is the cardinal sin of most social networks.