Like button

likeslikelikingLike" buttonliked+1 buttondislikedlike and dislike button+1click a button to vote up a story
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 they like, enjoy or support certain content.wikipedia
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Star (classification)

five-starfive starstar
Other websites include more complex Web content voting systems, for example five stars or reaction buttons to show a wider range of emotion to the content.
This allows users to distinguish content more precisely than with binary "like buttons".

Twitter

tweetedtweettweets
Alongside "retweets", Twitter users could "favorite" posts made on the service, indicated by a gold star symbol.
Users can also "like" (formerly "favorite") individual tweets.

Surfbook

It allowed users share their information with selected people and approve posts using a "Like" button, and to link to external information.

Trust metric

reputation pointsattack-resistant trust metricDegree of trust

Communication software

Telecommunications softwarecommunicationcommunication app
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 they like, enjoy or support certain content.

Social networking service

social networkingSocial network servicesocial networking site
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 they like, enjoy or support certain content.

Online newspaper

news websitenews siteonline
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 they like, enjoy or support certain content.

Blog

blogsbloggerweblog
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 they like, enjoy or support certain content.

Content (media)

contentaudiomedia content
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 they like, enjoy or support certain content.

Rating site

Web content votingRating sitesRatings
Other websites include more complex Web content voting systems, for example five stars or reaction buttons to show a wider range of emotion to the content.

FriendFeed

The like button was first announced as a FriendFeed feature on October 30, 2007 and was popularized within that community.

Facebook like button

likedlikeslike
The Facebook like button is designed as a hand giving "thumbs up".

YouTube

YouTube channelYouTube.comYouTube Gaming
In 2010, as part of a wider redesign of the service, YouTube switched from a star-based rating system to Like/Dislike buttons.

YouTube Rewind 2018: Everyone Controls Rewind

YouTube Rewind 20182018 YouTube Rewindthe latest Rewind video
In 2019, after the backlash from YouTube Rewind 2018, YouTube is now considering options to combat "dislike mobs," including an option to completely remove the dislike button.

Despacito

Despacito (Remix)
For example, on January 23, 2019, the likes and dislikes on Despacito were frozen for about 8 hours.

Google

Google Inc.Google, Inc.Google LLC
Google has a like button called the +1 (Internet jargon for "I like that" or "I agree"), which was introduced in June 2011.

Internet slang

netspeakInternet jargonChat language
Google has a like button called the +1 (Internet jargon for "I like that" or "I agree"), which was introduced in June 2011.

Reddit

subredditReddit AMAReddit.com
On Reddit (a system of message boards), users can upvote and downvote posts (and comments on posts).

Internet forum

forumforumsmessage board
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 they like, enjoy or support certain content. On Reddit (a system of message boards), users can upvote and downvote posts (and comments on posts).

VK (service)

VKontakteVKVK.com
VK like buttons for posts, comments, media and external sites operate in a different way from Facebook.

List of most-liked YouTube videos

List of most liked YouTube videosmost liked videoliked
YouTube implemented a like and dislike button on these pages in March 2010, part of a major redesign of the site.

List of most-disliked YouTube videos

most-disliked video10 most disliked videos14th most disliked video on YouTube
YouTube implemented a like and dislike button on video pages in 2010 as part of a major site redesign.

Yahoo! Messenger

Yahoo MessengerYahoo!YIM
Messenger added a like button to messages and media.