Hashtag - Function

Function

Hashtags are mostly used as unmoderated ad-hoc discussion forums; any combination of characters led by a hash symbol is a hashtag, and any hashtag, if promoted by enough individuals, can "trend" and attract more individual users to discussion using the hashtag. On Twitter, when a hashtag becomes extremely popular, it will appear in the "Trending Topics" area of a user's homepage. The trending topics can be organized by geographic area or by all of Twitter. Hashtags are neither registered nor controlled by any one user or group of users, and neither can they be "retired" from public usage, meaning that hashtags can be used in theoretical perpetuity depending upon the longevity of the word or set of characters in a written language. They also do not contain any set definitions, meaning that a single hashtag can be used for any number of purposes as espoused by those who make use of them.

Because of their loose nature, hashtags often become more recognized as associated with particular topics of discussion based upon a more specific spelling of the hashtag (e.g., "#cake" as opposed to "#thecakeisalie") that will be differentiated from a more general spelling. However, this can also make it difficult for topics to become "trending topics" because people often use different spelling or words to refer to the same topic. In order for topics to trend, there has to be a consensus, whether silent or stated, that the hashtag refers to that specific topic.

Hashtags also function as beacons in order for users to find and "follow" (subscribe) or "list" (organize into public contact lists) other users of similar interest.

Hashtags can be used on the social network Instagram, by posting pictures and hashtagging it with its subject. As an example, a photo of you and a friend posted to the social network can be hashtagged #bffl or #friends.

Hashtags are also used informally to express context around a given message, with no intent to actually categorize the message for later searching, sharing, or other reasons. This can help express humor, excitement, sadness or other contextual cues, for example, "Just found out my mom is my health teacher. #awkward" or "It's Monday!! #excited #sarcasm"