Does the halacha of עד אחד נאמן באיסורין (a single witness is trusted in matters of prohibition) apply to a random internet users? If someone presents themselves as being a practicing Jew, can I take their word for it on information they give me?
For example, if someone says "I called the OU and they said that all cheese sold on Tuesdays is aged," can I believe him or her that the OU said such?
Does it make any difference if this anonymous internet user has a solid reputation of some kind or another?
I do not mean to ask if I can accept his or her halachic opinions - for that you should CYLOR.