We tell our clients all the time the power of adding fresh content to their websites, and to add a blog, and to use social media, I have photographic proof that this is what google are looking for, I was checking the ranking of my site today and hovered over the image and look hat it highlighted

can you see google itself has highlighted my last staus update via my facebook feed badge and used that to help with the SEO!

Proof positive that you need to embrace the world of social media to get ahead in google!