Well the positive part of Facebook can be keeping in touch with friends and family.
The negative side is it can be something that lowers our self esteem if we compare to others. I find a minimal approach where I have a designated time to be on there is good for me.
The problem with shutting down is you may lose content.
The plus side of shutting down is you can start over and make your account private and carefully select the friends that really are your friends.
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CANDC