[gord]

Webkits share cookies = ouch.. so you really need a VM.

New browser feature - open this site in a temp VM.

[randomdata]

These days, most browsers come with a private browsing feature, which will dump your cookies, caches (for etag tracking), etc. when you're done.

[cpeterso]

If users must visit social websites like Facebook in privacy mode in separate browsers, perhaps they should rethink whether they should be using Facebook at all.

[jr299]

The convenience/security trade-off varies user to user, but for something as simple as FB, it might be considered overkill by most.

I would encourage browsers that support isolated profiles, multiple browsers that don't share cookie storage, or using a jailed site-specific browser approach.