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reacji is an emoji reaction, the use of a single emoji character in response to a post, introduced as a feature by Slack[1].

Slack reacji


Slack was first to ship a built-in reacji feature that allows anyone to respond to any Slack message with a single emoji, which are then tallied like votes.



Why should you support receiving reacji and displaying them? So people can send you reacji and have it show up? E.g. a ūüéā for your birthday.

How to

How to markup

Markup a reacji response post as follows:

Post a reply where the content is a single emoji character.

How to receive and display

You can detect a reacji reply post by inspecting any incoming reply to see if it is a single emoji character. This is harder than it seems as there are many possible emoji sets and some emoji can consist of multiple characters combined. Just looking for the single character emoji will cover most emoji however.

  • Be sure to remove whitespace as there may be some extra at the beginning or end unintentionally
  • backfeeds twitter replies with the @username at the front, you may want to strip this
  • You may want to strip HTML tags to make sure they don't prevent you recognizing an emoji

Once you have detected the reacji and what emoji it is, display it as a reaction like you display likes, followed by the count next to it or stamped on it like in the Slack example above.

IndieWeb Examples

Examples of receiving and displaying reacji:

Ben Roberts

Ben Roberts has reacji in Postly as of 2015-12-16 (his birthday, send him a ūüéā)

IndieWeb Reacji Posts

reply posts consisting of a single emoji character.

Aaron Parecki

Aaron Parecki has been posting reacji since 2015-12-16.


Tantek Çelik has been posting reacji since 2015-12-16.

    • is also a like post (hence the /f in the URL) for fallback purposes, so that targets that understand likes but not reacji at least get the positive sense of the reacji being communicated. This method only makes sense for like-like reacji, but that's an acceptable limitation.


Peter Molnar added reacji support to his wp-webmention-again WordPress plugin

Greg V

Greg V has been displaying reacji since 2016-03-21.

Silo Examples

Besides Slack, individuals have started to post reacjis on other silos.


Slack showing reactions: slack reaction display.png

Emoji reaction selector: slack emoji response.png


Twitter seems ready to roll out official support for 'reacji' in the near future:

Until then, people have been experimenting on their own...


Main article: reacjweet

There are examples of individuals posting reacji as tweets (reacjweets as it were)

emoji survey

A tweet author can simulate a limited curated set of reacji by posting a survey with only single-emoji responses. E.g.


Facebook has reacji (Path-style, as a small set of emoji-like graphics) as an extension of "Like" since 2016-02-24.




Path has had limited reacji, as a small set of emoji-like graphics, since (??? their launch) years ago, and was likely the first silo to do so.

(need screenshot)





  • We should call this reactions instead of reacji. The rest of the industry already does - Slack, Facebook, GitHub, etc. Common terminology is more valuable than minor semantic differences. (Lots more discussion in IRC.) - Ryan Barrett

See Also

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