Hashtag

hashtags#hash tag#-sign#hashtag#SochiProblems#T4TChallengecashtaghashhashtagging
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.wikipedia
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Twitter

tweetedtweettweets
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.
Users can group posts together by topic or type by use of hashtags – words or phrases prefixed with a “ ” sign.

Instagram

Instagram StoriesInstagram LiveInstagram account
For example, on the photo-sharing service Instagram, the hashtag #bluesky allows users to find all the posts that have been tagged using that hashtag.
The app allows users to upload photos and videos to the service, which can be edited with various filters, and organized with tags and location information.

Number sign

#hash symbolhash
The number sign or hash symbol "#" is often used in information technology to highlight a special meaning.
Since 2007, widespread usage of the symbol to introduce metadata tags on social media platforms has led to such tags being known as "hashtags", and from that, the symbol itself is sometimes called a hashtag.

Chris Messina (open-source advocate)

Chris MessinaChris Messina (open source advocate)
The use of hashtags was first proposed by Chris Messina in a 2007 tweet, that, although initially decried by Twitter as a "thing for nerds" eventually led to their use rapidly becoming widespread throughout the platform.
Christopher Reaves Messina (born January 7, 1981) is the inventor of the hashtag as it is currently used on social media platforms.

Je suis Charlie

#JeSuisCharliedemonstrationsJe suis
For instance the slogan "Je suis Charlie," which was first used on Twitter as the hashtag #jesuischarlie and #iamcharlie to indicate solidarity with Charlie Hebdo offices attacked in Paris, spread to the internet at large.
The statement was used as the hashtag #jesuischarlie and #iamcharlie on Twitter, as computer printed or hand-made placards and stickers, and displayed on mobile phones at vigils, and on many websites, particularly media sites.

Folksonomy

folksonomiessocial taggingfolksonomic
This process is called folksonomy.

@midnight

@midnight with Chris HardwickAt Midnight with Chris HardwickComedy Central's @midnight
The late-night television comedy game show @midnight with Chris Hardwick on Comedy Central features a daily game entitled "Hashtag Wars," in which three comedians compete against one another to come up with phrases based on a given hashtag theme.
Other games run daily include "Hashtag Wars" in which contestants buzz in with a phrase based on the given hashtag theme, and where fans can submit their own tweets which may show up in the game, and "Live Challenges" where the contestants write their answers over the commercial break.

Google Search

GoogleGoogle.comGoogle Instant
Real-time search aggregators such as the former Google Real-Time Search also support hashtags in syndicated posts, meaning that hashtags inserted into Twitter posts can be hyperlinked to incoming posts falling under that same hashtag; this has further enabled a view of the "river" of Twitter posts
Hashtag search links were also supported, as were "promoted" tweets hosted by Twitter (located persistently on top of the river) and thumbnails of retweeted image or video links.

American Dialect Society

The first published use of the term "hash tag" was in a blog post by Stowe Boyd, "Hash Tags = Twitter Groupings," on August 26, 2007, according to lexicographer Ben Zimmer, chair of the American Dialect Society's New Words Committee.

Sina Weibo

WeiboSinaSina microblog
In China, microblogs Sina Weibo and Tencent Weibo use a double-hashtag-delimited #HashName# format, since the lack of spacing between Chinese characters necessitates a closing tag.
A user may post with a 140-character limit (increased to 2,000 as of January 2016 with the exception of reposts and comments), mention or talk to other people using "@UserName" formatting, add hashtags, follow other users to make their posts appear in one's own timeline, re-post with "//@UserName" similar to Twitter's retweet function "RT @UserName", select posts for one's favorites list, and verify the account if the user is a celebrity.

The Tonight Show

Tonight ShowTonightThe Tonight Show with Jay Leno
An example of trending "temporary" hashtags garnering viewers during broadcasts is observed on The Tonight Show with Jimmy Fallon, a variety talk show on NBC.

Digital on-screen graphic

DOGbuglogo bug
Broadcasters may display a hashtag as an on-screen bug, encouraging viewers to participate in a backchannel of discussion via social media prior to, during, or after the program.
Beginning in 2010, some networks began to display show-specific hashtags alongside their bugs, which encourage viewers to discuss and interact with the program online via social networking services such as Twitter.

Hashtag United F.C.

Hashtag United
The YouTuber Spencer FC used the hashtag for the name and crest of his YouTube-based association football team, Hashtag United F.C..
The club's badge is yellow and blue, with the club's name emblazoned on the horizontal lines of a hashtag symbol.

Camel case

CamelCasePascalCasecapitalised
The use of embedded capitals (CamelCase) increases legibility and avoids confusion; a (real) pen shop would be advised to use #PenIsland rather than all lower-case.
Hashtags, especially long ones, often use camel case to maintain readability (e.g. #CollegeStudentProblems is easier to read than #collegestudentproblems).

StockTwits

StockTwits utilized "cashtags" with the stock ticker symbol, similar to the Twitter hashtag, as a way of indexing people's thoughts and ideas about a company and the stock.

The Colbert Report

Colbert ReportColbert NationColbert Universe
The emerging gesture was reported in Wired by Nimrod Kamer, and during 2013, it was seen on TV as used by Jimmy Fallon, and on The Colbert Report, among other programs.
The name had been used before without incident, but the show's official Twitter account — run by an unknown individual — tweeted the remarks without context, leading to wide outrage over social media, including a hashtag campaign, "#CancelColbert", that was a worldwide trending topic for over 24 hours, thanks in-part by Colbert himself helping make it go viral for his show.

Tag (metadata)

tagstagtagging
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.

Social networking service

social networkingSocial network servicesocial networking site
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.

Microblogging

micro-bloggingmicroblogmicroblogs
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.

Dynamics

dynamicDynamics (disambiguation)
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.

User-generated content

user-generateduser generated contentConsumer generated media
A hashtag (introduced by the symbol #) is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.

Image sharing

photo sharingphoto-sharingphoto
For example, on the photo-sharing service Instagram, the hashtag #bluesky allows users to find all the posts that have been tagged using that hashtag.

Millennials

millennialGeneration Ymillennial generation
As of 2018 more than 85% of the top 50 websites by traffic on the Internet use hashtags and their use is common by millennials, Gen Z, politicians, influencers, and celebrities worldwide.

Generation Z

Gen ZiGenerationinternet generation
As of 2018 more than 85% of the top 50 websites by traffic on the Internet use hashtags and their use is common by millennials, Gen Z, politicians, influencers, and celebrities worldwide.

Influencer marketing

influencerinfluencerssocial media influencers
As of 2018 more than 85% of the top 50 websites by traffic on the Internet use hashtags and their use is common by millennials, Gen Z, politicians, influencers, and celebrities worldwide.