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A tag reply is a special edit response to a post that tags that post with one or more tags, including possibly (or only) person-tags.


Tagging others' content is a very common silo UX and practice. By using your own site to tag others' content, you "ownyourtags" even if/when the silos die.

IndieWeb Examples

. None so far

Silo Examples


Flickr allows people to tag other people's photos, both with plain text tags, and person-tags.

The (person-)tag shows up immediately, there is no pending/approval/moderation.

By default, only your friends on Flickr can (person-)tag your photos. You can change that permission to allow everyone or no one.

Sometime in 2000s-2014(?), if you hovered over a tag on a photo/video permalink page, it would show an HTML popup indicating who added it and when.

(screenshot needed)

Flickr backfeed

If you POSSE your photos to Flickr, you should also backfeed the tags (including person-tags) added to the Flickr copy of your photo as tag-replies to your own site.

Bridgy Backfeed feature requests:

... other approaches?


Facebook allows people to person-tag other's photos.

If you hover over a person-tag on a photo/video, it shows an HTML popup card of that person, with small text at the top saying "Tagged by fullname" where fullname is the name of the person that added the tag.

(screenshot needed).

Facebook notifications

Facebook provides explicit notifications for person-tags, both:

  • When someone person-tags you in a photo
    • ... their photo:
      • (icon)(user) added a photo of you. (photo-thumbnail) / (datetime)
    • ... someone else's: (screenshot needed)
      • (icon)(user) tagged a photo of you. (photo-thumbnail) / (datetime)
  • When someone adds a person-tag to one of your photos (when you receive a person-tag reply)

(screenshots needed)

Facebook POSSE

When you post a person-tag reply, and (at least one of) your in-reply-to URLs is a Facebook post permalink (likely a photo), you should automatically POSSE your person-tag reply to that FB post.

Bridgy Publish feature request:

Facebook backfeed

If you POSSE your photos to Facebook, you should also backfeed the person-tags added to the FB copy of your photo as tag-replies to your own site.

Bridgy Backfeed Feature Requests:

  • ... other approaches?


Instagram does not have any ability for anyone but the author to add person-tags or hashtags.

Instagram backfeed

Still, it would be useful even in the case of the original author adding person-tags or hashtags to a POSSE copy on Instagram to backfeed them to the original.

Since author hashtags are implicit by including them inline in the caption or comments on the photo, if you are backfeeding comments and processing the hashtags in the comments as tag-replies, you should get this functionality automatically.

Related Bridgy Feature requests:


GitHub has the ability to add labels to issues, which are essentially tags.

Adding (or removing) labels from an issue causes a visible "action" among the comments on the issue (e.g. snarfed adding 'publish' label, thus showing a visible "tag-reply" at least inline (note: comments on issues also only show-up inline on an issue, they don't have non-fragment permalinks of their own).


Bridgy Publish feature request:


Until implemented (published, webmentioned, received, incorporated into an original post), these are brainstorming How to examples.

How to simple tag-reply

How to mark-up a tag reply, e.g. with the tags "indieweb" and "indiewebcamp":

Inside your usual h-entry, use:

<a class="u-tag-of" href="http://a.example.com/postpermalink37">...</a>
<span class="p-category">indieweb</span>
<span class="p-category">indiewebcamp</span>

And then send a webmention from your tag reply permalink to http://a.example.com/postpermalink37.

Doing so will tag that postpermalink37 with the tags "indieweb" and "indiewebcamp".

tag and fallback

To tag some other post, and provide fallback reply text to display for sites that support receiving reply posts but not tag-of posts, use the u-tag-of markup, and a u-in-reply-to plus p-summary for the fallback text.


  • "Tantek tagged Sebastian in this photo."


  • Something shows up instead of nothing, on sites that at least show comments
  • Fallback as new technology discovery mechanism. The "third person" verbage implies that there may be more markup for the specific type of response that the receiving site / person may want to investigate and support!

(markup example needed)

tag and comment

Alternatively, does this use-case make sense? To tag some other post, and comment on it at the same time:

Inside your usual h-entry, use:

<a class="u-in-reply-to u-tag-of" href="http://a.example.com/postpermalink37">...</a>
<p class="e-content">
This is a great post about the <span class="p-category">indieweb</span>
and <span class="p-category">indiewebcamp</span>.

And then send a webmention from your tag reply permalink to http://a.example.com/postpermalink37.

Doing so will tag that postpermalink37 with the tags "indieweb" and "indiewebcamp", as well as make the comment
This is a great post about the indieweb and indiewebcamp

person tag reply

To tag someone in someone else’s photo, post a person tag reply such as this, and send webmentions to all the links.

<span class="h-entry">
 <a class="p-author h-card" href="http://a.example.com/">Amber</a> 
 <a href="http://b.example.com/" class="u-category h-card">Bea</a> and 
 <a href="http://c.example.com/" class="u-category h-card">Crystal</a> 
 <a class="u-tag-of u-in-reply-to" href="http://d.example.com/permalink47">
  <img src="http://d.example.com/photo47.png" alt="Dawn’s photo of Bea and Crystal" /></a>

As a result of the webmentions:

  • Dawn's photo post will be notified that Amber has asked to tag Bea and Crystal in the photo.
  • IF Dawn accepts the person-tags on the photo THEN
    • Bea and Crystal will be notified that Amber tagged them in a photo.


person tag multiple URLs

Similar to person-tags in posts themselves, a person-tag reply should be able to embed an h-card with multiple URLs, e.g. a primary URL to the person's personal site, and URLs for their identity-elsewhere.

See person-tag#Tantek examples for person-tag h-cards with multiple URLs.

(needs markup example, e.g. above markup but with h-cards that have multiple URLs per person)

See Also