I found this posted at Foreclosurepedia. I have to say that I would not work for a firm that has such a clause in their contract. If they are great firm… what are they so worried about?
Subcontractor agrees and commits to not disparage, denigrate, defame, discredit, dishonor, injure, or otherwise communicate negatively about PE, directly or indirectly, while this Agreement is active and thereafter. This clause applies to both oral and written communications, including social media and other online type postings. […] The only exception for this section shall be if Subcontractor makes truthful statements about PE when compelled by court order, legal proceeding, or otherwise required by law. — Purdy Enterprise Disparagement Clause