Many web-sites you will find on the internet are referral companies, meaning they take your money and refer you to a broker in your area.  They find a broker who will agree to split the fee with them and then they are gone.   You then have a relationship for selling your home with a broker you have never spoke to and don't know, who has been paid a very small fee to get you listed.  In other words...the referral company is the middle man....between you and the broker who will list your property.   The most glaring problem with these companies is that the seller does not get to chose the Realtor....the referral company chooses the listing agent for the seller.