I used Chrome in Sandboxie, and even after deleted contents of the sandbox, youtube.com still recommended videos for me, which based on vids I saw.
Only after I deleted all history in Chrome then youtube did not recommend these vids.
All of these actions are in sandbox, then how can youtube track user even when I delete all contents of the sandbox? At first I think youtube is based on my IP so deleting contents is useless. But youtube will not give those recommended vids when I deleted browsing history when browse in sandbox, which seems it is not based on my IP anymore?
There must be some info stored somewhere, because after deleting all contents, youtube should not be able to recognize any history, which will equivalent to delete browsing history.
I don't think youtube can penetrate sandboxie, so the only other option is that there is info stored in server. Someone can give it a try and explain it to me:
1/ Install chrome and sandboxie, both are free.
2/ Run Chrome in sandbox mode, go to youtube.com, search and watch some vids, e.g. martial art, so you tube will recommend those kind of vids to you.
3/ Delete all contents of sandbox.
4/ Run Chrome in sandbox again, go to youtube.com and you will see those recommended vids. How can this possible? youtube.com must recognize user based on IP or something else.
5/ Go to history, check and clear everything.
6/ Go back to youtube.com, those recommended vids disappear. How can this possible? Where did the recognition info be stored that cant be deleted?