You help [https://immersion.media.mit.edu/ create the social graph] of your friends and associates. This is useful information to companies and security services. By remaining constantly signed in on your social network account in the browser, you are also disclosing your [https://trackography.org/ browsing habits] on the Internet in general, outside of their service.
There are alternative social networking services that are built with privacy in mind, including [https://diasporafoundation.org/ Diaspora], [httpshttp://wwwretroshare.piddersourceforge.de Piddernet/ RetroShare], [https://gnu.io/social/ Gnu Social] and a recently launched [https://www.minds.com Minds] for Android and iOS.
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