Broken up into what exactly? If you don't like Facebook don't use it. How about the Senate and the internet outrage machine spend time on companies like Equifax instead, who (1) we literally cannot opt out of, (2) have private data that we didn't choose to share with them, and (3) have broken actual laws but haven't received as much as a slap on the wrist for it.
Zuckerberg's talking point from his AP photographed note sheet ( https://i.imgur.com/3UP1b4X.jpg ) is a good one. If you break up the major US tech platforms, it cedes leadership of those sectors to Chinese competitors. Something to think about in discussions about breaking up Facebook, Amazon, and Google.
If you break of the platforms into smaller separate companies, why would that cede leadership to Chinese companies?