dont leak your info from Facebook or twitter or any from any social media site to the third parties means wherever you browse or search something , google , Facebook like sites monitor your behavior. so here is some top add-ons to protect from social media and search engines tracking

1 : Adblock plus (firefox,chrome,safari)

2 : disconnect facebook (chrome,firefox,safari)

3 priv3 (firefox)

4 : no script (firefox)

5 : disconnect (chrome,firefox,safari)

for other
check this out
enjoy and stay safe