This control helps users to take greater risks with their self-disclosures online. These people also begin to incorporate their Internet lives with their non-Internet lives and engage in a presence–control exchange. In this exchange, Internet users start their relationships with relatively high control and gradually trade that for physical closeness as their comfort levels and knowledge of the other person increases. This seems to be the Internet version of social penetration theory, where individuals have a mutual exchange of self-disclosures. As the relationship develops in face-to-face communication the individuals' disclosures gradually become more revealing and cover a wide range of topics. This equivalent on the Internet includes the partners exchanging control of the conversation for physical closeness. The stages this occurs in could include moving from messaging online, to telephone conversations and eventually face-to-face communication.