> For the complete documentation index, see [llms.txt](https://docs.flowbridge.app/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.flowbridge.app/documentation/social-integrations/facebook-messenger/facebook-specific-variables.md).

# Facebook Specific Variables

As part of FlowBridge Connect functionality, we will populate your flow with specific variable that you can use at your own will. All you need to do is create the variable name in Voiceflow and FlowBridge Connect will automatically populate them with information

Here are the Facebook specific variables you can create:

| Variable Name     | Value   | Description                                                                                                |
| ----------------- | ------- | ---------------------------------------------------------------------------------------------------------- |
| Channel           | String  | the channel the user is communicating on. It will be "facebook" for Facebook conversations                 |
| user\_id          | Integer | Facebook Page-Scoped User ID (PSID) (e.g., `1234567890`)                                                   |
| channel\_user\_id | Integer | This is the same as `user_id` and exists only to unify the variable naming across all integration channels |

For more information on the variables, check out the [Automatically Populated Variables page](/documentation/basics/automatically-populated-variables.md)