When people are recruiting they're willing to jump through hoops that hired employees often resist. For example, if you ask applicants to fill out a survey before having their resumes reviewed, compliance will be higher than emailing a survey to current employees.
There's an opportunity to help companies collect personality information during the recruiting process that HR can use to check for culture fit and to optimize on-boarding.
I'm not sure what form this would take. It could be something like the common app for undergraduate admissions where applicants would answer questions that would be included with applications submitted through that platform. Or, it might be something that companies only ask of applicants that are offered interviews.
Assigning mentors during on-boarding based on real shared interest as opposed to shared alma mater or favorite sport seems like a major upgrade.