I don't see looking up anyone online as a problem whether it's a therapist, a client or anyone else. It's all publicly available information and I really don't understand what a big deal is about it. We live in the age when much more personal information about people in general has become publicly visible, mostly because they themselves put it into a public domain. There is certainly a dark side to it when the information is being bought and sold by private companies, but this is more of a political issue. On a personal level, I don't see anything immoral or unethical in looking at the info of a person, who has made a choice to make their information publicly available for anyone to see. Everyone looks up everyone online these days and everyone should expect that anyone would look them up online. No special "disclaimers" are needed and no one is obligated to inform people about it. In fact, I wouldn't work with a therapist who has it in their informed consent that they do online search on clients. To me, if they put it into their informed consent, they emphasize and blow out of proportion something that is natural and mundane. I wouldn't mind at all if they looked me up online, but if they talked about it in their informed consent, it'd feel creepy.