Social media objectives should:

flow from, and directly support, social media tactics adhere to the S.M.A.R.T. framework (Specific, Measurable, Achievable, Resourced, Time-bound) adhere to the CCAF framework: context, challenge, activity, feedback be finalized early, so marketing goals can be designed around them be independent of …
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The Facebook page moderation Feature:

none of the above prevents a user from posting too many comments on your wall prevents comments that contain certain words from being posted prevents a user from expressing negative sentiment about your brand