Methods and systems for contact firewalls on mobile computing devices

A method of generating a contact firewall for protecting participants of a sender-controlled media (SCM) platform, the method comprising:

• receiving an indication that a sender who is not a participant in a sender-controlled media (SCM) platform has initiated contact with a recipient who is a participant of a sender-controlled media (SCM) platform;
• using sender information associated with the contact instance to pole participants of the platform regarding a spammer status value for the sender;
• aggregating the spammer status values received in the pole;
• and
• based on a comparison of the aggregated spammer status values with a spammer threshold, causing future contacts from the sender to be rejected by the platform so that the sender is blocked from contacting participants of the platform.