Which technique helps identify a passive candidate's digital footprints, interests, and peers?

The technique that effectively identifies a passive candidate's digital footprints, interests, and peers is PeerSearch. This method focuses on analyzing the online presence and activity of potential candidates, revealing insights into their professional connections, interests, and overall engagement within their industry. By utilizing PeerSearch, recruiters can gather valuable data that may not be available through conventional recruitment methods, allowing for a deeper understanding of a candidate's background and fit for a role.

The other techniques listed, while potentially useful for various aspects of recruitment, do not specifically focus on uncovering the nuanced digital footprint and social connections of passive candidates in the same comprehensive manner that PeerSearch does. This distinction highlights the importance of using the right tools to gain a clearer view of candidates who may not be actively seeking new opportunities but possess desirable qualifications and connections.