It was IDF soldiers indiscriminately posting photos that accidentally revealed intel to Hamas about the function and location of all buildings in the base, as well as how much time it would take for patrol and response time.
Many often wonder why more Israeli civilians are not armed. We now learn that not even all the IDF personnel were armed! These soldiers were stationed in the base just several yards (meters) away from Gaza:

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Source: Jerusalem Post, 4 March 2025 pg 1 & 7. "IDF: Social media posts aided invasion." https://www.jpost.com/israel-news/defense-news/article-844513