Your website (and email list) is always -- always -- a priority. You don't own Facebook, Google+, Twitter, or any other social network. While they are amazing tools, you have, relatively speaking, very little control over your social channels.
If Facebook or Google wants to make changes, they can and will -- maybe those changes are good, but maybe they're bad and you lose a segment of your audience. It's happened plenty of times in the past.
If your website is your main hub and your email list is your primary connection between you and your target market, there's essentially no one that can take that away from you.
Your social channels should be an extension of your website/blog and brand, not the other way around.