This is why I use isolated sessions when browsing. I compartment my surfing these days because of this exact type of attack (identities and other browsing artifacts spilling over into serendipitous/casual/random browsing). Mozilla are even going to ship this strategy in Firefox soon[1]. Another strategy to lessen the amount of data collected on you is to outright disable Facebook like buttons and Twitter share buttons, because these widgets track you as you navigate around the web. This can be done in uBlock origin[2] under the '3rd party filters' tab and selecting Fanboy's annoyance filter list alongside Anti-ThirdpartySocial filter list.
[1]: https://wiki.mozilla.org/Security/Contextual_Identity_Projec...
> Individuals behave differently in the world when they are in different contexts. The way they act at work may differ from how they act with their family. Similarly, users have different contexts when they browse the web. They may not want to mix their social network context with their work context. The goal of this project is to allow users to separate these different contexts while browsing the web on Firefox. Each context will have its own local state which is separated from the state of other contexts