The limits of social media marketing

Hi,
I'm encountering lots of limitations with SMM. Some of my articles, materials do propagate, but eventually the visitor stream stops. One has to create newer and newer content to attract visitors and most of the time they don't buy anything, they only return for curiosity.
Essentially:
*part of my material gets propagated, but for a very short period of time
*people do return and do become loyal to my site, but the don't bring much money – instead, they look around, comment, watch photos…
The limits of social media marketing

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