| authorrank | A probability distribution modeled on PageRank (q.v.) used to determine the quality of an article on the basis of the reputation of its associated author. AuthorRank was introduced into search algorithm analysis by Google in 2011 and increased the perceived value of personas (q.v.). |
| opacity | Noun. 1) A metric or measure of a range of search listings (q.v.) for a query which are not obviously optimized to be included in the search results. A perfectly opaque search result (q.v.) has an Opacity value of 1.0, reflecting the fact that none of the search listings (q.v.) are obviously optimized for placement in the result. 2) The characteristic of being opaque in the sense of appearing to be natural to a casual, uninformed observer of a group or collection of natural, transparent, or opaque objects. |
| directories | Directories are a lot like phone books for web sites. You submit your site to a directory to help people find your site. The most popular of these types of sites are Yahoo! Directory and Dmoz. |
| remarketing | A marketing strategy that involves serving ads for previously viewed websites or products to a user. These are the ads that seem to follow users across the internet, advertising something they may have looked at days ago. |
| pay-per-click | or PPC: Online advertising approach that determines the cost of an ad by the number of people who click on the ad. |
