Please note that I may not agree with all that is said in this article. Non-the-less, it makes some good points
http://www.offgridquest.com/tips-tricks/maintaining-privacy-in-a-digital-worldMy personal choice is to not use the social media, period.
I heartily agree with the use of "throw away" email addresses and having multiple aliases. I use some for online payment transactions and other only for email messages.