Social Networks privacy
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Almost of Social Networks make their business profiling you. They can track, create a bubble of our tastes, targeting and a lot of powerful information that we can give to them. Nothing is free there are always business behind.
We should add to this services Dual authentication, in many cases we are sharing part of your personal and private life. Even if we limit our friend list, someone with bad intentions my try to gain access to our account.
In terms of reducing the bubble effects of target advertising , we can opt-out on many of Ad preferences.
Limit your information and Ad Settings:
Twitter ad preferences(Personalization and Data)
Control what are tagging from you: https://www.facebook.com/settings?tab=timeline
Control your privacy: https://www.facebook.com/settings?tab=privacy
https://www.instagram.com/accounts/privacy_and_security/
https://twitter.com/settings/safety
https://myaccount.google.com/privacycheckup/
And there are a lot of more information that you can restrict.