“…The debate between pros and cons of public sex offender registries remains (13–20). A careful protocol must thus be discussed thoroughly among multiple stakeholders, including solving several key issues, such as: (1) suspects in suspicious incidents positioned and posted by citizen users should be anonymized and only available to certain groups (e.g., local polices) before any formal investigation; (2) citizen users posting suspicious incidents should be identifiable by certain groups (e.g., different levels of administrators responsible for target locations) for investigation purposes; (3) before confirmation, actual locations of suspicious incidents should be offset toward a random direction by a maximum of 2 kilometers in urban areas and a maximum of 5 kilometers for rural areas, for example; and (4) after confirmation, the information of criminals may be to different extents available to various groups (e.g., the full identity might be only available to local polices and kindergarten/school administrators).…”