Settlement agreements usually include a confidentiality clause limiting who the plaintiff can inform about the agreement. This is usually limited to attorneys, tax advisors, and spouses. However, many people probably share the news with other family members. Unfortunately for one plaintiff, this article illustrates the pitfalls of violating the confidentiality clause.
http://www.miamiherald.com/2014/02/26/3961605/daughters-facebook-boast-costs.html