If you mean credit card details and social security numbers then no.
But if you mean saying who you really are than why not? If your leading a double life by being here and also still pretending to be a witness (something I will never really understand) I guess one could rationalise that somehow. But if you want to be real and true to yourself than why not just stand up and be counted?
Many here have already wasted large parts of their lives in a false organisation.. why waste what's left still not being who you really are and going to great lengths to conceal yourself? Plenty here show their real identities and what harm has come to them?
Not being true to yourself is far more damaging than anything anyone else can do to you.