My employer added a clause in my last NDA stating that I was prohibited from saying anything "disparaging" about the company. Now when anyone asks about job postings I tell them, "I'm contractually obligated not to say anything disparaging about them." None have ever applied.
@fesshole Previous employer made everyone sign the new contract, earlier starts, finishing later, tighter controls, change to KPI's, stricter conditions. The lot. A handful of us didn't sign it. They couldn't make us. Most learnt too late. Management were furious but their hands were tied because only the new contract gave them the power to take action.
They fucking hated us!