# How to Auto-Post From X (Twitter) to Other Social Media Networks
Author: Davis Baer
Author URL: https://www.oneupapp.io/blog/author/davis-baer
Published: 2026-09-08
URL: https://www.oneupapp.io/blog/how-to-auto-post-from-x-twitter-to-other-social-media-networks

Cross-posting content manually from X (formerly Twitter) to platforms like Instagram, Facebook, or TikTok can easily become a tedious task. However, by using xAI's Grok alongside a social scheduling platform like **OneUp**, you can set up an automated workflow that syncs your posts seamlessly.

In this guide, we'll walk through how to connect Grok to OneUp to automatically repost content from X across your other social channels.

## What You Need Before Starting

- **Grok Access:** An xAI account with custom connector support.

- **OneUp Account:** Connected to the target social profiles (e.g., Instagram, Facebook, Threads, LinkedIn, TikTok, YouTube, etc.) where you want posts automatically shared.


## Step-by-Step Guide

### Step 1: Retrieve Your OneUp API Key

1. Log in to your **OneUp** dashboard.

2. Click the **Gear** icon in the upper dropdown menu and select **API and MCP**.

3. Copy your unique **API key**.


### Step 2: Add the Custom Connector in Grok

1. Open Grok and navigate to the **Plugins** section.

2. Select **New Connector** and choose **Add Custom Connector**.

3. Set the connector name to `OneUp`.

4. Grab the connector endpoint URL from the **OneUp API Documentation** (under the MCP connector section).

5. Append your actual **OneUp API key** to the end of the URL where indicated, then click **Add Connector**.


### Step 3: Prompt Grok to Set Up the Auto-Posting Rule

Once connected, instruct Grok in natural language to monitor your X account and cross-post to your desired channel.

**Example Prompt:**

> _"Set up an auto-post rule that cross-posts any photo or video post from my connected X account over to my \[Account Name\] Instagram account."_

_Note: For image- and video-first platforms like Instagram, the rule will automatically filter out text-only posts since media is required._

### Step 4: Test the Automation

1. **Publish on X:** Post an update containing an image or video on your X account.

2. **Automated Trigger:** The connector automatically checks for new posts on the hour.

3. **Manual Trigger (Optional):** To test instantly, go to the **Automations** tab in Grok, find your new `X → Instagram` rule, and click **Run Now**.


### Step 5: Confirm in OneUp

Open your **OneUp** dashboard or calendar view. You will see that the post—complete with the original caption and attached media—has been automatically formatted and queued or published to your destination account.

## Supported Platforms

Using this Grok and OneUp setup, you can automatically cross-post content from X to a wide variety of destinations, including:

- Instagram

- Facebook

- TikTok

- Threads

- YouTube Shorts

- Bluesky

- Snapchat

- Google Business Profiles


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