---
title: "Webhook: definition for social media posting"
url: "https://get1post.com/glossary/webhook.md"
canonical_url: "https://get1post.com/glossary/webhook"
last_updated: "2026-10-23"
type: "conceptual"
summary: "What webhook means in social media posting, in plain words, with how 1Post handles it."
related: ["https://get1post.com/glossary.md", "https://get1post.com/guides/send-a-webhook-when-a-post-publishes.md"]
---

# Webhook: definition for social media posting

What webhook means in social media posting, in plain words, with how 1Post handles it.

A webhook is a message one system sends to a web address you choose when something happens, such as a post being published. The message carries the details as JSON. Signing the message lets your system confirm it came from the sender and was not changed on the way.

1Post sends signed webhooks on every plan and lets you send a test message.

A webhook is also a destination: a post can be sent as signed JSON to your own address.

## Questions

**How do I know a webhook is real?**

Check its signature against your secret. 1Post signs every message.

## Related

- [Social media posting glossary: terms explained](https://get1post.com/glossary.md)
- [How to send a webhook when a post publishes](https://get1post.com/guides/send-a-webhook-when-a-post-publishes.md)