Reference checking your referrals is an archives tag for lorenweisman.com for brand messaging strategist and a keyword phrase for a blog he wrote.
Many times, people jump on the referral chain gang of sorts. They go out and promote those that they might not even know are any good, but seem to have a large platform to promote others.
The backfire of this type of marketing is that it can hurt you, your authority, reputation and your brand messaging strategy at the same time.
Adding that time to reference checking your referrals helps to protect you, your reputation and your professionalism as you helps others morally, ethically and professionally.