I have a question along a similar line..that is these moral conflicts that come up as a result of the internet...is it a sin to be anonymous on the internet? To deliberately hide your identity or tell white lies about yourself as an assumed avatar on a chat board?
Gee I hope not!
Regarding online forum anonymity: No, it is not a sin, because you are merely withholding personal information the knowledge of which it is neither proper nor necessary for others to know: in fact, people on the internet cannot claim a right to know what pertains to your person. Revealing such things may be imprudent at times.
Regarding "white lies:" The culpability of these lies depends on the intention whereby one pronounces such lies and situational factors and consequences that may lead to scandal (i.e., white lies can lead to more white lies, to more complex white lies, to copying and pasting stuff from Wikipedia). Just don't do it.
On the other hand, I personally opine that it is a sin for a Priest or Bishop to anonymously participate on internet forum or chat rooms, and it is a cause of great scandal for them to tell "white lies" while doing so for whatever reason.
This is why I don't like Traditio. "Father Moderator" and the "Traditio Fathers" could be anyone or anything, and they are using their self-imposed "clerical authority" to promulgate gross errors and and pronounce moral judgments that are mostly erroneous and scandalous.
Priests and Bishops should avoid the internet anyways. They are supposed to be busy with either prayer or tending to souls. They should only use email for purposes of contacting the faithful who submit inquiries or have no other means of communicating with them.