Like

The appearance of the Facebook Like button

A like button, like option or recommend button is a feature in communication software such as social networking services, Internet forums, news websites and blogs where the user can express that he/she likes, enjoys or supports certain content. Internet services that feature like buttons usually display the quantity of users who liked each content, and may show a full or partial list of them. This is a quantitative alternative to other methods of expressing reaction to content, like writing a reply text.

Some websites also include a dislike button, so the user can either vote in favour, against or neutrally. Other websites include more complex Web content voting systems, for example five stars.

Like buttons as used by social networks on websites other than their own are often used as web bugs to track user activities for targeted advertising such as behavioral targeting combined with personally identifiable information (PII) and may be considered a breach of browser security and internet safety privacy concerns.^{[1][2][3][4][5]}

Use on Facebook[link]

The like button is a feature of social networking service Facebook, where users can like content such as status updates, comments, photos, links shared by friends, and advertisements. It is also a feature of the Facebook Platform that enables participating websites to display a button which enable sharing the site's content with friends.^[6]

When a user clicks the Like button, the content appears in his/her friends' News Feeds.^[7] The button also displays the number of users that liked each piece of content, and may show a full or partial list of those users. This feature may appear differently on mobile web applications.

Facebook describes liking as a way for users to "give positive feedback and connect with things [they] care about."^[8]

A "Like Box" also allows Facebook page owners to see how many users and which of their friends like the page.^[9]

A lawsuit was filed in Los Angeles in 2010 claiming the Facebook should not allow minors to like advertising; Facebook said the suit was "completely without merit."^[10]

Plug-in[link]

The Like button is one of Facebook's social plug-ins, which are for use on websites outside Facebook,^[11] a feature which launched April 21, 2010, as part of Facebook's Open Graph, an interface for integrating websites with Facebook's social graph.^[12][13] Speaking at Facebook's F8 developer conference on the day of the launch CEO Mark Zuckerberg said, "we are building a Web where the default is social."^[13][14]

Since then the feature has aroused scrutiny over privacy concerns because the social plug-ins allow Facebook to track visitors to participating sites across the web, even if those visitors do not click the Like button,^[3][4] are logged out of Facebook, or are not Facebook users at all.^[5] The Like button is implemented similarly to an advertising network, and as more sites participate, gives Facebook a vast amount of information about who visits which sites, and when. When loading a web page which has the Like button enabled, the user's browser connects to Facebook's servers, which record the URL being visited, and the visitor's IP address and Facebook ID (if logged in). In June 2010, Facebook said it has made this information after three months, and does sell or otherwise share that information. The ACLU of Northern California cautioned website operators to be careful about installing Like buttons because "they're potentially telling Facebook about everyone who visits their web site, every time that person visits their web site."^[4]

By September of that year over 350,000 sites were using the Like button.^[15]

In August 2011 the German state of Schleswig-Holstein said the button breached German data protection laws and that federal agencies must remove the buttons and similar social plug-ins from their websites.^[2] Canada's Privacy Commissioner had raised similar concerns in 2010.^[1]

From the end of 2010 and in the US, Microsoft's Bing search engine identifies which links in the results have been "Liked" by the searcher's Facebook friends.^[16][17]

Vulnerability to attacks[link]

"Like" links are vulnerable to likejacking, a form of clickjacking that makes users "Like" content they did not intend to.^[18]

Use on other social networks[link]

In August 2011, Google integrated its +1 button to its competing social networking site Google+.^[19] (The name "+1" is Internet slang for "I like that" or "I agree".) The social microblogging site Twitter also launched a "Follow" button around the same time.^[20]

In popular culture[link]

In 2011, an Israeli couple named their child Like after the Facebook feature.^[21]

References[link]