Different state jurisdictions
may have different laws concerning the government licensure of speech pathologists. In California, for example, a speech pathologist must be licensed no different than a lawyer, physician, accountant, nurse, physical therapist, etc. In which case, my answer would be unchanged, if you intend to offer your services to persons located in California -- which as the most populous state, usually determines the baseline requirements for any website operated by a U.S. citizen.
Note: As a practical reality, internet business owners typically start operations and then "ask questions later." Large revenue streams created by businesses that appear to be engaged in a valuable public service, are frequently overlooked by government, because of the concern that the public will excoriate the government prosecutors for taking away a bona fide means of employment and a valuable service.
However, that doesn't make a particular service legal -- so, you have to measure your risk. I can assure you that, for example, were justanswer.com to start allowing the physicians here to contact customers in State jurisdictions where the physicians are not licensed and personally diagnose and prescribe treatment for customer-specific illness or injury, or similarly, allowed attorneys to contact customers in jurisdictions where the attorneys were not licensed and draft specific wills and trust instruments or business contracts
So, what matters here is exactly what you propose to do any how you propose to do it, and especially whether or not your activity will have a substantial negative affect on the profession of speech pathology as it is currently conducted The more profound and negative the effect (and that includes the negative economic effect on traditional "brick and mortar" speech pathology activities, the greater your risk.
Hope this helps.
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