# Facebook Cookies

> Reference for the _fbc and _fbp cookies and the fbclid parameter, and how AnyTrack includes them in Conversion API attribution data.

Meta Ads uses [cookies to support its attribution and tracking processes](https://developers.facebook.com/docs/marketing-api/conversions-api/parameters/fbp-and-fbc/). The two main cookies relevant for advertisers are `_fbc` and `_fbp`.

AnyTrack records the values of these cookies and the Meta click ID (`fbclid`) and includes them in the attribution data for all conversion events sent to the Conversion API via your connected Tracking Tags.

## Cookie and Parameter Reference

| Identifier | What it is | How AnyTrack uses it |
| --- | --- | --- |
| `_fbc` | Meta browser cookie used for attribution | AnyTrack records the cookie value and includes it in the attribution data for that user. |
| `_fbp` | Meta browser cookie used for attribution | AnyTrack records the cookie value and includes it in the attribution data for that user. |
| `fbclid` | Meta click ID, a URL parameter Facebook automatically appends to ad links and links on its platforms | AnyTrack includes the `fbclid` value in the attribution data of conversion events sent to the Conversion API. |

## How the fbclid Reaches Your Site

Facebook automatically appends the `fbclid` parameter to all ad links and links on its platforms, so it arrives on your landing page as part of the URL.

<Image alt="Facebook automatically appends the fbclid to all links" align="center" border={true} src={readmeAsset1} caption={"Facebook automatically appends the fbclid to all ad links and links on their platforms."} />

## How AnyTrack Records These Values

AnyTrack records the values of the `_fbc` and `_fbp` cookies and includes them in the attribution data for that user.

<Image align="center" className="border" border={true} src={readmeAsset2} />

<br />

<Image alt="AnyTrack will include the fbclid in the attribution" align="center" border={true} src={readmeAsset3} caption={"AnyTrack will include the fbclid value in the attribution data."} />

## Related Resources

<Cards columns={2}>

  <Card title="Facebook Conversion API" href='/docs/facebook-conversion-api' icon="fab fa-meta">
    How AnyTrack sends server-side conversion events to Meta.
  </Card>

  <Card title="AnyTrack Identifiers" href='/docs/anytrack-identifiers' icon="fa-duotone fa-solid fa-fingerprint">
    Reference for the identifiers AnyTrack uses across tracking and attribution.
  </Card>

</Cards>