Can I sign up for more than one Alumnifire community?

Of course! As long as you're actually a member of more than one community in real life, you can join them on Alumnifire. When you do, your profile will be automatically populated with basic information you completed for your first account (like your name, location, industry, education history, career history, etc.). You'll only need to complete the information that is specific to the new community (like what are you willing to do to help fellow members, how often, etc.).