Just confirmed that Chromium reuses the same google-analytics connection for two completely separate web sites and it keeps the socket open for 4 minutes. It a

Just confirmed that Chromium reuses the same google-analytics connection for two completely separate web sites and it keeps the socket open for 4 minutes. It almost certainly does the same thing for doubleclick.net. If you spend less than 4 minutes per page then that entire browsing session across all google-analytics pages is uniquely identified to google. Even if you have many people behind a NAT and they have 3rd party cookies disabled, each one's browsing is still a separate clickstream to Google. Only thing making a person's browsing opaque to google is if they browse behind a proxy with a bunch of other people mixed in, and SPDY/HTTP2 conveniently enough make proxies very difficult by needing to trust the proxy's certificate on each client. So anybody needing a proxy will use HTTP1 and anybody using HTTP2 has their browsing sessions uniquely identified.