Harvard happiness expert Daniel Gilbert identified this as one of the biggest sources of happiness in our lives. Relationships are worth more than you think (approximately an extra $131,232 a year.) Not feeling socially connected can make you stupider and kill you. Loneliness can lead to heart attack, stroke and diabetes. The longest lived people on the planet all place a strong emphasis on social engagement and good relationships are more important to a long life than even exercise. Friends are key to improving your life. Share good news and enthusiatically respond when others share good news with you to improve your relationships. Want to instantly be happier? Do something kind for them.