Photo: Google CEO Sundar Pichai, Twitter CEO Jack Dorsey and Facebook CEO Mark Zuckerberg (l-r). Photo: BloombergWhen the chief executives of Facebook, Google and Twitter testify Wednesday before a Senate committee on how they control content on their services, they will argue against rolling back Section 230 of the Communications Decency Act, which shields internet companies from lawsuits over user-generated posts. That’s where their agreements may end.Much as with their diverse approaches to handling problematic posts involving everything from hate speech to unfounded political...…Photo: Google CEO Sundar Pichai, Twitter CEO Jack Dorsey and Facebook CEO Mark Zuckerberg (l-r). Photo: BloombergWhen the chief executives of Facebook, Google and Twitter testify Wednesday before a Senate committee on how they control content on their services, they will argue against rolling back Section 230 of the Communications Decency Act, which shields internet companies from lawsuits over user-generated posts. That’s where their agreements may end.Much as with their diverse approaches to handling problematic posts involving everything from hate speech to unfounded political...WW…