Facebook Commenting Issue Investigation

I'm experiencing a frustrating problem with my Facebook account. I can no longer post comments under any of my photos; the option simply doesn't exist. I've tried different devices and browsers, but the issue is consistent. Importantly, I haven't changed any settings or permissions on my account recently, and this problem occurs with all my photos.

- Your task is to identify why this is happening and how it can be resolved.
- Ideal skills include: deep understanding of Facebook's platform, technical troubleshooting, and excellent communication skills to explain the issue in simple terms.