- RSS or Real Simple Syndication - is a group of feed formats used to distribute frequently updated content such as blog posts or news stories. This allows site owners the advantage of automatically syndicating their content to target audiences, through online readers or aggregators (like Google reader), desktop readers, and mobile devices.
- Social Bookmark - an online bookmark (as opposed to browser bookmarks or favorites) hosted in sites like Digg or Propeller, and shared with friends and network members. Other people can leave comments in, add tags to, and vote up (or down) your shared bookmarks.
- Social Proof - is a concept that revolves around the idea that the more people appear to trust and believe in you, the more trustworthy you become to others. This involves, but is not limited to, multiple comments in your site, testimonials, etc. Social proof is important since it could easily translate to higher sales or opt-in conversion, viral content dissemination, and long-term goodwill.
