A system identifies a significant communication from a revived contact. A user and the contact interact, and the interaction is monitored to determine a weighted significance value to attribute to the contact. The interaction may include communication, a designation of significance by the user, and organizational associations. The weighted significance value is attributed to the contact. A subsequent communication is detected and a weighted time difference value for the subsequent communication is determined. If the subsequent communication satisfies a significant communication condition, then the subsequent communication is designated as a significant communication.