Abstract: To help professionals (source users) reach other professionals (target users), a computer-based system may use as input user contacts and publicly available information to deduce relationships and output ranked paths that originate from the source users, go through third persons that are trusted-referrals or parts of trusted-referral circles, and end at the target users. Trusted referrals can make introductions with an increased probability that both sides will be willing to work with each other. The trust attribute is based on the nature of the relationship between two people and is also measured by strength, based on additional relationship parameters. Exemplary system uses include: a business person locates trusted referrals who can make an introduction to executives of a company, for the purpose of offering consulting services; and people who launched a project locate trusted referrals that can introduce them to angel investors/firms, to obtain project finding.