Word of Mouth usually refers to "one friend referring another friend" to your service. If I have a friend that tells me he/she has used your service and that you are trustworthy and good at what you do, then I will most likely use your service also. Word of Mouth is an excellent reference. Now if you are talking about recommendations (stars) on Amazon or eBay, or feedback for transactions here on InForum.in, then that is also excellent references. But beware on sites that do not offer controls on feedback. You can also "buy" favorable results on some sites then it is not a true indication of quality of service. If you are wanting to get good feedback for your services, you will not need to buy it IF you really offer good services. Most people now are more than happy to share their experiences