The Oregon Bar has published an ethics opinion addressing the following specific questions:
1. May Lawyer review a person’s publicly available information on a social networking website?
2. May Lawyer, or an agent on behalf of Lawyer, request
access to a person’s non-public information?
3. May Lawyer, or an agent on behalf of Lawyer, use a
computer username or other alias that does not identify Lawyer when
requesting permission from the account holder to view non-public
information?
The opinion is available here. Go here for more information and links to opinions from other jurisdictions on the same or similar topics.