According to Mayo Clinic, studies have found that friendships and other forms of social support can enhance self-esteem, improve mental health, and reduce cardiovascular risk, to name a few. And people with larger social circles had a 50% lower mortality risk than those who didn’t.

Here are some ideas for building your social network:

Volunteer. Pick a cause that's important to you and get involved. You're sure to meet others who share similar interests and values.

Join a gym or fitness group. You can make friends while you exercise. Look at gyms in your area or check a local community center.

Reach out to neighbors. Take the opportunity to talk with those who live around you. You might find that you have more in common than you realize.

Take a class. A local college or community course puts you in contact with others who share similar hobbies or pursuits.

Look online. Social networking sites can help you stay connected. Stick to reputable sites and be cautious about arranging in-person meetings.

Attend (online) meet-up or networking events. This is a great place to meet people in the same field to discuss current topics or connect about job opportunities.

A successful relationship is a two-way street that requires your active participation. Here are some suggestions for nurturing your relationships:

Stay in touch. Answering phone calls, returning emails and reciprocating invitations let people know you care.

Don't compete. Be happy instead of jealous when your friends succeed.

Be a good listener. Listen when your friends are speaking. Ask good follow-up questions. Find out what's important to them. And provide a judgment-free zone for them to express their thoughts and feelings.

Appreciate your friends and family. Take time to say thank you and express how important they are to you.

Give back. Be the kind of friend you would want. Be supportive and encouraging when your friends and family are in need.