YouTube isn't an island (as a famous poet once didn't say), and you won't give yourself a chance to build your subscriber base if you don't venture outside its walls. There are a couple of ways to do this. Firstly, make sure that your social networks are linked to your YouTube channel so that your fan base can follow you wherever you may be active. Sounds obvious, but we are still seeing a lack of a cohesive strategy when it comes to social video marketing. You can assume that your followers, and potential followers will take the time to find your presence on the internet, or you can make it easy for them, and provide links. Assuming that you are taking the time to be active on social media, posting links to your new, or most popular, video content should be second nature. This notifies your followers, and gives them the opportunity to like, share, retweet, revine, your video, meaning you will reach more people. Result!