As C4C creates an ID for each lead (Main_Contact_ID), the contact then replicates in SMC and, despite the lead being associated with an existing contact, or a new contact created, SMC retains all the IDs. For example, if we generate 3 leads for the same contact, this will generate four contact IDs in SMC.
Although the EIM job will flag and merge the contacts, we are still left with the additional IDs. In one case, a contact had 30 IDs. Are there any recommendations upon avoiding this?