This is why I use 'browser isolation', which is a way to separate different types of surfing activity into different buckets. Currently the best way to do this in Firefox is to create multiple profiles, or in Chrome, you can simply add a different user/persona.<p>Having one profile, or even an entire dedicated browser just for Twitter/FB ensures the login is not spilled over into other sites. If you're surfing the web heavily, I would recommend spawning a new private window so cookies, and other artefacts are not bleeding into your session.<p>It sounds like common sense, but many people have cookies and login information persisting for years at a time in their browsing sessions. The Mozilla Firefox team are planning to introduce a feature which makes compartmented surfing sessions a lot more user-friendly by separating sessions into tabs. Currently, the 'profiles' feature of Firefox is not user friendly and requires a bit of tinkering with the filesystem.