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The 10 Algorithms That Dominate Our World

Interested article published by George Dvorsky in I09. I would add credit card transaction scoring to detect fraud, and scoring in general such as FICO or Experian scores. What would you add to the list below?

1. Google Search

There was a time not too long ago when search engines battled it out for Internet supremacy. But along came Google and its innovative PageRank algorithm.

The 10 Algorithms That Dominate Our WorldSEXPAND

Today, Google accounts for 66.7% of the U.S. market share in core search, followed by Microsoft (18.1%), Yahoo (11.2%), Ask (2.6%), and AOL (1.4%). Google now dominates the market to the point where we don't even question it anymore; for many of us, it's our primary avenue of entry into the Internet.

PageRank works in conjunction with automated programs called spiders or crawlers, and a large index of keywords and their locations. The algorithm works by evaluating the number and quality of links to a page to get a rough estimate of how important the website is. The basic idea is that the more important or worthwhile websites are likely to receive more links from other websites. It's basically a popularity contest. In addition to this, the PageRank algorithm considers the frequency and location of keywords within a web page and how long the web page has existed.

2. Facebook's News Feed

As much as we may be loathe to admit it, the Facebook News Feed is where many of us love to waste our time. And unless your preferences are set show all the activities and updates of allyour friends in chronological order, you're viewing a pre-determined selection of items that Facebook's algorithms have chosen just for you.

The 10 Algorithms That Dominate Our World12SEXPAND

To calculate which content is most interesting, it considers several factors, such as the number of comments, who posted the story (yes, there's an internal ranking of "popular" people and those with whom you interact with the most), and what type of post it is (e.g. photo, video, status, update, etc.).

3. OKCupid Date Matching

4. NSA Data Collection, Interpretation, and Encryption

5. "You May Also Enjoy..."

6. Google AdWords

7. High Frequency Stock Trading

8. MP3 Compression

9. IBM's CRUSH

10. Auto-Tune

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