Social media marketing is the process of creating an community online or gaining increased awareness of your brand or product in existing online communities. It combines the objectives of Internet Marketing with social networking sites such as Twitter, Facebook, Flickr, LinkedIn, and Digg.
Make tagging and bookmarking easy - SMO (Social Media Optimization) ready website has features such as quick buttons to "digg this", "get RSS feed" relevant tags in content.
Most sites are "static", content updates rarely and it is out of date, which is a bad attribute for a website that wants to be linked as highly as possible, updating your website more often can drive more traffic and increase its SEO and SMO exposure.
Allow users to rank, rate, and organize content and member posts. User generated ratings and tags not only help to organize content, they also make users feel connected to the content.