Answer and Explanation:
1. Eharmony was born out of Neil Clark Warren's(clinical psychologist and marriage counselor) research work on the psychology of satisfactory relationships through weighing compatibility by certain notable characteristics in individuals. It was on this basis that he set up eharmony which matches people based on principles from his research
2. Eharmony matches people using Neil's principles and this sets him apart from other dating sites
3. It worked so well because there was evidence that it Neil's matching couples model works because real couples were involved in the ad
4. Key advertising concepts was the involvement of real couples who started their relationship through eharmony showing that it actually works
