What are the setbacks for using of the word of mouth as an advertising medium?

[Stardom22]

Despite being cost effective and most efficient kind of advertising medium, the word of mouth has its own challenges. So what are the most common challenges for using that kind of venture for business advertising?

 

[eLdavis]

One major setback with using word of mouth is that you are only limited to your current location. The Internet makes it easier to reach out to more persons.

 

[Laurentta]

A major setback of using word of mouth advertising is it is typically limited to a local area or social circle.