The reasons companies care about customer-to-customer communication include the following:
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Customers are more loyal if they are originally referred by friends or family members.
(Studies have shown that referrals often lead to higher loyalty and retention rates.) -
Customers take recommendations from friends more seriously than recommendations from advertising.
(Peer recommendations are generally seen as more trustworthy than traditional advertising methods.)
The other two options are less relevant:
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Customers can easily be influenced by well-known product spokespeople.
(While this is true, it doesn’t directly relate to customer-to-customer communication, as it pertains more to influencer marketing.) -
Customers who provide reviews can eliminate the need for a marketing department.
(This is an exaggeration; while customer reviews can significantly contribute to marketing efforts, they don't eliminate the need for a marketing department altogether.)
In conclusion, the first two options are the main reasons companies pay attention to customer-to-customer communication.