Quote:
Originally Posted by shake
Porn mode… your browser has it for a reason 
Incognito - Private Browsing - Private Window etc..
Generally that will keep you logged out of everything including google |
Even if your browser ignores (incognito) the PREF cookie, or you regularly clear cookies, your IP is still logged. Unless your IP is dynamic, or you use an anonymising service with multiple IPs (like Tor), they'll still be able to tie searches back to your ISP account.
Don't forget that there's a bunch of Google services which may be embedded into other websites, that will "leak" evidence of other browsing activities - analytics, recaptcha, plus, etc.
Consider that every time you load a thread on GFY with a youtube embed you are transmitting the referer (the thread URL) to Google.
edit: I see GFY uses Analytics, so make that every thread on GFY that they see the URL of.