Half the screen was filled with green and purple static when taking a selfie

Hello Clairerupp98,

Thank you for using the Apple Support Communities! Based on the details you've provided, it sounds like you are experiencing an issue with the camera while using Instagram. I am happy to help.

To confirm, is this only an issue when using camera within Instagram? Or, are you experiencing an issue with your camera in other applications, including the native Camera app?

If this is only isolated to the Instagram app in particular, it is not a hardware-related camera issue. Instead, you will want to follow the steps found here to troubleshoot the specific third-party application itself: If an app unexpectedly quits, stops responding, or won’t open - Apple Support If the issue remains after you complete all of the steps in the above article, you'll want to report the behavior to the app developer, as shown in step 5.

If you happen to notice this camera failure with all applications that use your camera, including the native Camera app, you should follow these steps: If the camera on your iPhone, iPad, or iPod touch isn't working - Apple Support

Reach back out if you need continued support.

Take care.

The trouble is Facebook's and they need to update their software.