Users must be careful what they tweet.  Twitter is subject to vast potential liability, as is any electronic communication tool.  Tweets are no different from letters, e-mails, or text messages.  Tweets may be damaging and discoverable.  This poses significant problems for heavily-regulated companies who are required to preserve and maintain electronic records.  Examples of such companies include the securities industry and federal contractors.  These companies will have an additional compliance step to handle, not even considering the potential for privileged and/or private information to be leaked out.²²