I have no idea how common it is for therapists to advertise online or in other media in Sweden. My T does not advertise - his name and phone number is listed on the county health care website, and a couple of yellow pages type websites, but that's all as far as I know. He seems to be pretty much fully booked all the time, from what I can tell, so I don't think he's felt the need to advertise (but that's just my guess.)