Every year, I get about a dozen or so brand new clients from various social media platforms like LinkedIn, Facebook and Twitter. So start by connecting with talent agents, producers, eLearning companies, video production businesses and anyone you feel is a potential VO buyer.
The key is to take a vested interest in your connections. Ask questions and make comments on their posts. Don't just drop a link to your website in a comment thread. That always has the appearance of being somewhat spammy or intrusive. Instead, be engaged and have conversations.