Can I advertise or recommend the use of services from certain service providers such as inspectors, moving companies, or repair contractors on my website?

Yes. However, if you advertise the use of a service provider and expect to receive compensation from that service provider when someone uses his services, your ad must disclose that arrangement. Keep in mind that acceptance of certain fees from service providers may violate RESPA or other laws, so consult with an attorney about any fees you receive.

Source: TAR