Likes can add "social proof". If you perceive that others of your peer group like something are doing something it makes it more likely you will too.
So these likes from friends help make it more likely customers and potential clients may like us too. Those are the ones that matter more. Though FB is a limited media unless you are paying to boost your post.
Additional having more likes make it more likely more will see your post. Only a certain percentage of those who like your page will see your post without paying to boost it.
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