Key Online Metrics

Alexa Traffic Ranking (from Alexa.com) - 'Alexa's traffic rankings are based on the usage patterns of Alexa Toolbar users over a rolling 3 month period. A site's ranking is based on a combined measure of reach and page views. Reach is determined by the number of unique Alexa users who visit a site on a given day. Page views are the total number of Alexa user URL requests for a site. However, multiple requests for the same URL on the same day by the same user are counted as a single page view. The site with the highest combination of users and page views is ranked #1.' More on Traffic Ranking from Alexa.com

Google PageRank (from Google.com) - 'PageRank relies on the uniquely democratic nature of the web by using its vast link structure as an indicator of an individual page's value. In essence, Google interprets a link from page A to page B as a vote, by page A, for page B. But, Google looks at more than the sheer volume of votes, or links a page receives; it also analyzes the page that casts the vote. Votes cast by pages that are themselves "important" weigh more heavily and help to make other pages "important."' More on PageRank from Google.com

Technorati Authority & Rank (from Technorati.com) - 'Technorati Authority is the number of blogs linking to a website in the last six months. The higher the number, the more Technorati Authority the blog has.'

'Technorati Rank is calculated based on how far you are from the top. The blog with the hightest Technorati Authority is the #1 ranked blog. The smaller your Technorati Rank, the closer you are to the top.' More on Technorati Authority and Rank from Technorati.com

Tags - (from Wikipedia) 'A tag is a keyword or term used to classify content by means of a folksonomy. Tags are usually chosen informally and personally by the author/creator of the item — i.e. not usually as part of some formally defined classification scheme.'  More on tagging from Wikipedia.org