Project Decorum will allow you to create and manage a large number of different identities. These identities may act as pseudonyms, providing you with anonymity whenever you need it. Unlike many existing social platforms, Project Decorum will never in any way enforce usage of your real identity.
Identities make use of cryptographic signatures to prove ownership of content to others to prevent impersonification. This is of course handled automatically by the software.
Web of trust
Every identity maintains it's own web of trust by default, though these can be merged into a larger web of trust if the user chooses. Although doing so would allow people to link your identities, it will be easier for your identities to gain the trust of others. You can read more about Project Decorum's web of trust here.