Facebook Messenger channel overview

Learn more about starting a conversation via connected Facebook Messenger channels and their supported features

Written By Frieda Yip (Super Administrator)

Updated at March 25th, 2026

ℹ️ What’s supported in SleekFlow

Here are the features available for Facebook Messenger in SleekFlow:

  • Connect multiple Facebook Pages to a SleekFlow account
  • Send and receive Facebook pages messages with customers
  • Automatically reply to Facebook post comments 
  • Use Facebook Messenger as a channel to set up automated workflows in Flow Builder
  • Integrate with Facebook Lead Ads

If a feature isn’t listed here, it’s currently not supported in our integration with Facebook Messenger.

 

 

Facebook Messenger is a powerful tool that allows businesses to connect directly with their customers through real-time messaging. By connecting your Facebook Page’s Messenger with SleekFlow, you can manage and respond to customer inquiries efficiently from a unified platform.

Starting a conversation

On Facebook Messenger, businesses can respond to customer messages within a 24-hour messaging window. This window starts when a customer sends a message to your Facebook Page and resets each time the customer replies.  

Within this 24-hour period, you can send free-form responses to continue the conversation.

If a customer comments on your Facebook Page’s post or story, you can also send a private reply to initiate a conversation. Once the customer responds, a new 24-hour messaging window begins.

After the 24-hour window closes, businesses can no longer send free-form messages unless using Meta-supported re-engagement methods (such as marketing messages or other opt-in-based messaging features, depending on availability).
 

Note: Meta has deprecated Messenger message tags, including the Human Agent tag that previously extended the response window to 7 days. As a result, businesses should plan to respond within the standard 24-hour messaging window.

 

 

Supported message type in SleekFlow's Inbox

1. Text

You can compose and send text messages directly.  You can input up to 2,000 characters per text message. 

2. Voice message 

Type Supported format Supported size maximum
Audio .ACC, .M4A, .WAV, .MP4 25 MB

 

3. Image

Type Supported format Supported size maximum
Image .PNG, .JPEG, .GIF 8 MB

 

4. Video

Type Supported format Supported size maximum
Video .MP4, .OGG, .AVI, .MOV, .WEBM 25 MB

 

Unsupported message types in SleekFlow Facebook Messenger channels

Certain message types are not supported when using SleekFlow with Facebook Messenger:

  • Sending voice messages
  • Sending stickers
  • Reacting to messages
  • Sending PDFs
  • Sending recorded videos