If a sponsored listing lacks recommendations, it may not drive as much foot traffic as one with the social endorsement of a users friends.
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In the next month or two, it will open up to users' friends and family members, then go public.
Messaging app Voxer, which has a walkie-talkie feature, was blocked from accessing users' friends lists by Facebook in January.
What would make privacy on the site much better, though, is if Facebook would let its users delete friends and old postings en masse.
In January, Facebook also blocked Vine's access to users' friends list.
Even more unsettling, three of the top 10 most used apps, including Farmville, have been found to have dished out the IDs of their users' friends.
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Twitter has said that it will update the language it uses on the site to make it clear what will be done with that information -- which helps new users find friends who are already using the site.
Taste Savant aggregates and curates content from sources users trust including their friends, critics, bloggers, and other users in the know.
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And users pay to reach international friends who are not Rebtel users, although the rates are 40% lower than Skype charges.
Mr. Marini said that his company seeks minimal data about users and their friends.
Facebook users from our sample on average can reach 156, 569 other Facebook users through their friends of friends.
The searches could then be refined to see photos of the users, their friends and places they've worked.
Facebook users have 130 friends on average and over 200 million people use their mobile devices to access Facebook.
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Shop with Friends users become buyers at 2.5 times the average conversion rate they see from online shoppers in general.
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They thought it was a good idea to upload the address books to help users connect with friends who use the same app.
For example, the law might require Facebook to disclose more about how third-party apps receive information about users through their friends, Ms. Ozer said.
To encourage users to get friends to join, each friend a person adds on FreedomPop will give an extra 50 megabytes per month of data.
They take its existing Facebook Connect product a few steps further by bringing users' Facebook friends lists to external sites and showing them their friends' activity.
In fairness, Facebook says that it only uses facial recognition to help users tag their friends by suggesting a name and not to identify random people.
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When Facebook users logged on to the Find Friends Nearby site, they were supposed to be able to see friends and other Facebook users who were in close proximity.
Both attempts at digital board-gaming demonstrate how Scrabulous filled a niche by drawing on Facebook's greatest asset--what Zuckerberg calls "the social graph, " the links between users and their friends.
The Highlight smartphone app, which alerts users when their friends are in proximity, must be accessed through a Facebook account, even though in theory it could work independently of Facebook.
Reports suggested Apple made the move after Google proved unwilling to upgrade its service unless it was allowed to include more of its own branding and Latitude - a service which shows users where their friends are located.
Privacy concerns over the issue were touched off last week when a Web developer blogged about his discovery that Path, an emerging social app that limits users to 50 friends, was uploading his iPhone address book to its servers.
Whereas in the 1990s, Web companies shelled out tens of millions of dollars on advertising to find users, today's social media leaders like LinkedIn acquire new users through network effects -- their services become more valuable to users when their friends sign up.
On Monday, Apple said its coming iOS 6 operating system for the iPhone and iPad, expected out in the fall, will let a player challenge friends to a game while also allowing users to sync the Game Center friends list with Facebook to find friends easier.
Graph Search capitalizes on Facebook's massive bank of data about its users, or "social graph, " to seek out friends, or other users who have made their information public, using information about them.
Facebook announced Facebook Gifts, which lets users make purchases for friends directly through the social network.
It also added technology that allows users to see what friends do on certain websites.
Zuckerberg has apologized for the company's Beacon ad program, which lets users track their Facebook friends' activities on other sites.
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