ActiveRain is a large real estate networking site with over 166,000 members nationwide. It provides professional and consumer channels on topics like homebuying, sales, mortgages, and real estate training. Professionals can write articles and blog to both promote their business and share knowledge. Membership allows networking opportunities between real estate agents, title reps, loan officers, inspectors, and brokers. An optional $29.99/month upgrade provides additional promotional and business development tools.