---
title: Likes and Reposts
description: Lexicon reference for app.certified.feed.like and app.certified.feed.repost, social feedback on records of any lexicon.
---

# Likes and Reposts

`app.certified.feed.like` · `app.certified.feed.repost`

## Overview

A **like** (`app.certified.feed.like`) records that an account liked a record. A **repost** (`app.certified.feed.repost`) resurfaces a record to the reposter's followers. Both can point at a record of any lexicon, such as an activity, a collection, or an evaluation, and both live in the repository of the account doing the liking or reposting.

They are social feedback only. A like is not an evaluation, an endorsement, or an acknowledgement, and it says nothing about whether the work happened or had impact. For assessments, use an [evaluation](/lexicons/hypercerts-lexicons/evaluation); for accepting a relationship, use an [acknowledgement](/lexicons/hypercerts-lexicons/acknowledgement). That is also why these records live in the `app.certified` namespace rather than `org.hypercerts`.

Both records use the same shape as Bluesky's `app.bsky.feed.like` and `app.bsky.feed.repost`, so indexers that already handle those can handle these with little change. For how applications find records across repositories, see [Why AT Protocol?](/core-concepts/why-at-protocol) in the Guide.

## How it's used

- **Showing appreciation.** A user likes a project's latest activity. Apps show a like count and let people see who liked it.
- **Spreading the word.** A funder reposts a project's activity so its followers see it in their feeds.
- **Crediting discovery.** When someone likes or reposts a record they found through a repost, `via` points at that repost. Indexers and applications use it to credit the account that surfaced the record and to trace repost chains.
- **Counting.** Indexers count likes and reposts by `subject.uri`, so all versions of a record share one count. The `subject.cid` still tells readers which version each person saw.

To undo a like or a repost, delete the record.

## Like schema

A like names the liked record with a strong reference, pinning the version the account saw.

**Record key:** `tid` · **Lexicon version:** 1.4.1 · [View the schema](https://github.com/hypercerts-org/hypercerts-lexicon/blob/v1.4.1/lexicons/app/certified/feed/like.json)

### Required properties

| Property | Type | Description |
|---|---|---|
| `subject` | `strongRef` | Strong reference to the record being liked. May be a record of any lexicon (e.g. an activity, a collection, or a repost's subject). |
| `createdAt` | string (datetime) | Client-declared timestamp when this record was originally created. |

### Optional properties

| Property | Type | Description |
|---|---|---|
| `via` | `strongRef` | Optional strong reference to the record through which the subject was encountered, typically an app.certified.feed.repost. Lets AppViews credit the account that surfaced the subject. Mirrors the optional `via` field on app.bsky.feed.like; the referenced record may conform with any lexicon. |
| `signatures` | [`app.certified.signature.defs#list`](/lexicons/certified-lexicons/signatures#list) | Optional cryptographic signatures attesting to this record's content. |

## Repost schema

A repost uses the same strong-reference subject and optional `via`.

**Record key:** `tid` · **Lexicon version:** 1.4.1 · [View the schema](https://github.com/hypercerts-org/hypercerts-lexicon/blob/v1.4.1/lexicons/app/certified/feed/repost.json)

### Required properties

| Property | Type | Description |
|---|---|---|
| `subject` | `strongRef` | Strong reference to the record being reposted. May be a record of any lexicon (e.g. an activity or a collection). |
| `createdAt` | string (datetime) | Client-declared timestamp when this record was originally created. |

### Optional properties

| Property | Type | Description |
|---|---|---|
| `via` | `strongRef` | Optional strong reference to the record through which the subject was encountered, typically another app.certified.feed.repost. Lets AppViews trace repost chains and credit the account that surfaced the subject. Mirrors the optional `via` field on app.bsky.feed.repost; the referenced record may conform with any lexicon. |
| `signatures` | [`app.certified.signature.defs#list`](/lexicons/certified-lexicons/signatures#list) | Optional cryptographic signatures attesting to this record's content. |

## Example

A funder reposting a project's activity:

```json
{
  "$type": "app.certified.feed.repost",
  "subject": {
    "uri": "at://did:plc:4yyb5gyoxl3sqdlqrvuxshkp/org.hypercerts.claim.activity/3lx2k9f2abc2d",
    "cid": "bafyreigh2akiscaildcqabsyg3dfr6chu3fgpregiymsck7e7aqa4s52zy"
  },
  "createdAt": "2026-09-13T11:20:00.000Z"
}
```

A follower of the funder liking the same activity, found through that repost:

```json
{
  "$type": "app.certified.feed.like",
  "subject": {
    "uri": "at://did:plc:4yyb5gyoxl3sqdlqrvuxshkp/org.hypercerts.claim.activity/3lx2k9f2abc2d",
    "cid": "bafyreigh2akiscaildcqabsyg3dfr6chu3fgpregiymsck7e7aqa4s52zy"
  },
  "createdAt": "2026-09-14T17:05:00.000Z",
  "via": {
    "uri": "at://did:plc:ewvi7nxzyoun6zhxrhs64oiz/app.certified.feed.repost/3lxbq2wz7hk2c",
    "cid": "bafyreidfayvfuwqa7qlnopdjiqrxzs6blmoeu4rujcjtnci5beludirz2a"
  }
}
```

## Rules and best practices

- **Point the subject at the original record, not at a repost.** When liking something found through a repost, the subject is the reposted record and `via` is the repost.
- **Pin the version that was shown.** Set `subject.cid` to the CID of the version the user actually saw. A like or repost is about content as seen; if the record is edited later, the reference still shows what the person reacted to.
- **Count by URI, show the version when it matters.** Indexers typically group likes and reposts by `subject.uri`. If an app shows that someone liked or reposted an older version, it can say so, as it would for an evaluation of an earlier version.
- **Don't treat likes as evaluations.** Likes are free and easy to produce in volume. Don't use like or repost counts as a measure of quality, impact, or verification, and don't label a ranking based on them as anything other than attention.
- **Expect any lexicon in `subject` and `via`.** Both can reference records of any type. Keep the record and show the subject as unavailable if it can't be resolved.
- **Likes and reposts differ from follows on purpose.** An [entity follow](/lexicons/certified-lexicons/follows) uses a URI without a CID so it survives edits to the followed record. A like or repost pins a CID because it is about a specific version.

## Related

- [Follows](/lexicons/certified-lexicons/follows): following accounts and records across updates.
- [Evaluation](/lexicons/hypercerts-lexicons/evaluation) and [Acknowledgement](/lexicons/hypercerts-lexicons/acknowledgement): records that carry assessment or acceptance.
- [Activity Claim](/lexicons/hypercerts-lexicons/activity-claim) and [Collection](/lexicons/hypercerts-lexicons/collection): records commonly liked and reposted.
- [Signatures](/lexicons/certified-lexicons/signatures): the optional `signatures` property.
- Guide: [Records That Change Over Time](/architecture/data-flow-and-lifecycle), [Why AT Protocol?](/core-concepts/why-at-protocol).