I never doubt that many therapists look up clients - why wouldn't they? I also look up pretty much everyone I work with.

Same for me. I don't use any personal social media, only LinkedIn. And anonymous forums like this. But I am often quite interested in other people's stuff, including my ex therapists'. Why not? And why would they not be, at least some clients? I think it can be quite informative to see how someone handles social media and what they post, including when some people don't use it. I don't look at others' social media very regularly but sometimes I have an urge and then spend hours on it. Searching in secret, because I do not have active profiles.