If you are purchasing Advertising on these networks, there are some guidelines and best-practices.
Facebook maintains a list of Ad Guidelines here: https://www.facebook.com/policies/ads/
Here are their (current) highlights:
When running a Facebook ad, you can specify ad targeting.
It is often a good idea to remove your own network of friends from the audience via targeting, as they will see your promotions through organic reach of your posts.
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