[dub]

Both "confesses" and "fesses up" seem like improper English here. The article does not provide any evidence to suggest that Twitter was reluctant about sharing this information or lied about it previously.

"Disclosed" seems like a more sensible and less sensationalist word to describe an entity sharing new information. The writer knows this: "Twitter has disclosed" are the first words of the article.

Twitter also apologized, said they're taking steps to avoid making this mistake again, and provided a way to contact their Office of Data Protection for questions. That part didn't make it into the headline, though.