The algorithm is the key to success.
That's how Google replaced Yahoo as the Web's best search engine in  1998. Google became the font of the online world's information by both  finding more information online than any other search engine, and by  figuring out what of it was the most important to the Web's users.  Google algorithmically connected the Web to people. 
Facebook, by contrast, has always been about connecting people  to each other, but as the the latest version of the Facebook platform  illustrates, the company is now about using that information to do what  Google has traditionally done: connect people not just to each other,  but to things, ideas, and media. 
The algorithm is a big part of today's announcement at the F8  developers' conference. The algorithm can determine what you're likely  to like based on who you like, what you do, where you go, which apps you  use (and how), and so forth--all of which is information that Facebook  will now collect through its own service and all the apps that are being  built to run on it. 
Google also knows what you do online, but it doesn't have  close to the same depth of personal information that Facebook has, for  two reasons. First, Google's core service, search, is a way station, not  a destination. Google knows where you're going because you transit the  site and because you may be tipping it off through your browser's search  bar or through ads on the sites you visit. But Facebook is a  destination. People go to Facebook and stay there. And communicate. And  like. And so on. All the while, Facebook collects the data. 

 Second, Facebook knows who your friends are. In addition to the  fact that you tell it this when you "friend" people, how and with whom  you communicate on the site is more data that Facebook's algorithm can  use to classify your connections to other people. When you respond to  what Facebook is now calling "lightweight engagement" activities in the  Ticker--when you decide to listen to a song alongside a friend, for  example--Facebook files away this information, building, bit by bit, a  dossier on your preferences and the people who are most likely to  influence you. 
For advertisers, this data is more valuable than Google's.  Facebook will be able to cluster likely interest groups together and  sell marketers access to those people. The company will be able to work  with media companies to make advertising on their pages more effective.  This is a serious and credible threat to Google's position as the Web's  premier advertising provider. 
For users, Facebook will, probably quickly, learn what each of  us is likely to like by watching what we do on the site. This will help  solve a big problem on a Web overloaded with novel information:  discovery. By mining the "data exhaust" collected from the activities,  links, likes, and so on that we all generate, Facebook should be able to  predict, with increasing accuracy, what we're most likely to engage  with, be it music or grocery ingredients.
If Facebook gets this wrong, users will continue to complain about the  new design of the site as being too cluttered and confusing. But if the  algorithm starts to feed people links to things they like but didn't  know they'd like, it means the algorithm is working and Facebook is on  its way to becoming the source of the most valuable information on the  Web: who likes what, who they influence, and how to reach the people  most likely to influence others (hint: go through their friends). 
It's scary to see one single company own this database, but  Facebook is coating this pill in sweet candy. We will find music we love  through it. We will connect with friends to go on hikes with it. We  will learn things from publications using Facebook because we see our  friends reading them. And we'll make the whole thing easier for our  friends, and Facebook itself. But stuffing Timelines full of personal  resumes of preferences and activities. 
There will likely be  privacy missteps along the way, as Facebook turns on the algorithm and  makes the data available to more developers through its platform. One  might be tempted to step away from Facebook or to try hard to not engage  with the flow of attractive links and media that comes through it. But I  think it's going to be hard for people to say no to what Facebook will  soon be offering.
ABOVE (( Mark Zuckerberg describes how Facebook will connect people to media based on the strengths of their connections to other people.
(Credit: James Martin/CNET))