1. A method for managing electronic identity cards, comprising: receiving personal information about a user of an electronic signature service; receiving activity information about actions of the user on the electronic signature service; receiving social networking information about the user, the social networking information including credentials used by the user to access a social networking service; generating, by a computing system, an electronic identity card that includes the received personal information, the received activity information, and a trust score that indicates a level of trust based on at least signing a previously received document via the electronic signature service; incorporating the received social networking information into the generated electronic identity card; tracking the activity information in response to document signature events occurring on the electronic signature service; incorporating statistics about the tracked activity information into the generated electronic identity card; and providing information about the generated electronic identity card in association with another document signed by the user via the electronic signature service.