Maggie, there is a trandard NDA wording in the User Agreement.
3.3 CONFIDENTIAL INFORMATION
Users may agree to any terms they deem appropriate with respect to confidentiality, including those set forth in the Optional Service Contract Terms. If and to the extent that the Users do not articulate any different agreement with regard to confidentiality, then they agree that this Section 3.3 (Confidential Information) applies.
To the extent a User provides Confidential Information to the other, the recipient will protect the secrecy of the discloser’s Confidential Information with the same degree of care as it uses to protect its own Confidential Information, but in no event with less than due care. On a User’s written request, the party that received Confidential Information will promptly destroy or return the disclosing party’s Confidential Information and any copies thereof contained in or on its premises, systems, or any other equipment otherwise under its control.