Blogging Mention

This may be done as a matter of getting the attention of (or drawing attention to) another user of a social networking or blogging service, as a matter of replying to the other user's post, or as a matter of "tagging" a user in a post

@ (at sign)

The rise to prominence of Twitter from its launch in 2006 gave rise to using the at sign ("@") as a description for directing a public post to a particular user, especially for the purpose of replying to another user's post (i.e., "@janedoe"). Only after the usage of @ as a visual means of directing posts to specific users gained currency among Twitter users did Twitter developers begin to integrate the @ sign as a fundamental conversational tool on the site.^{[citation needed]}

Initially, @ was used by Twitter users occasionally as shorthand for other words, such as location or time. The first person to use @ as a description of directing a post at another user was Robert S. Andersen ("rsa") on 2 November 2006;^{[self-published source]} initially, this usage made use of a space between the @ and the name, followed by a colon and the main content.^{[citation needed]}

The first to propose a general syntax for directly addressing users in posts were Ben Darlow and Neil Crosby,^{[original research?]} and by January 2007, more Twitter users began to take notice of the practice with various degrees of acceptance;^{[self-published source]} within the year, the convention trended toward combining the @ and a Twitter username (as opposed to a real name) and prepending the combination to the beginning of a post in order to indicate a reply. Ultimately, they became colloquially known as "@replies" for their primary usage as replies to other users' posts. Twitter added support for "@replies" beginning in May 2008,^{[non-primary source needed]} with any combination of @ with a username being turned into a hyperlink to the profile. On March 30, 2009, Twitter updated the feature and renamed it "Mentions" (i.e., to "mention" user "@janedoe") so as to include non-reply posts directed at individual users.^{[non-primary source needed]}

Beginning September 2009, Facebook integrated the at sign as a mentioning feature; typing "@" in a post automatically initiates a drop-down autocomplete list containing names of "friends", groups and pages, which, after one being selected and the post published, links to the profile, group or page.

@-replies started being used on Wiki around 2013.

YouTube started introducing @-handles in late 2022.

Distributed social networks and federated networks may use two at signs, the latter to indicate the instance/server which the mentioned users resides on. Example @[email protected] mentions the user janedoe on the server mastodon.social.

+ (plus sign)

The plus sign ("+") was utilized on Google+ to select a user or page.^{[citation needed]}

TinyMCE, an online rich-text editor supports mentions via the Mentions plugin.

CKEditor, an online rich-text editor supports mentions.

GitLab, a DevOps platform supports mentions in merge requests, issues, discussions, etc.

Mastodon supports mentions. User lookup is implemented using the WebFinger protocol.