Ramos shot and injured his grandmother prior to driving to Robb. She called the police after he left for the school, which Abbott mentioned earlier in the press conference.

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The New York Times has reported that Ramos exchanged messages with a teenage girl living in Germany, who he met on the Yubo app. But it is unclear if these are the same messages that Abbott and Stone were referencing, or what platform those messages were exchanged through.

Facebook has previously confirmed that it does monitor users’ messenger chats for abuse like harmful images and malware links, according to a 2021 company blogpost and 2018 reporting from Bloomberg. The platform also lets users report direct messages that violate community standards. However, it is unknown if, or to what extent, the company monitors chat text. And, counter to some circulating claims, Facebook has denied using targeting advertising based on the content of private messages.

Update 5/26/2022, 8:19 a.m. ET: This post has been updated with additional content from a New York Times report.

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Update 5/25/2022, 5:10 p.m. ET: This post has been updated with additional content from a Facebook company blogpost.