It makes me question - did it really take for these harassments to happen to his family for him to finally testify? I mean, we have an insurmountable level of evidence for 15 years now, about how bad and amplified online harassment has gotten through social media.
And, trying to reason with a sycophant like Mark is going to be a waste of time so I think he shouldn't have bothered. Unless it's about money, Mark won't care. Look at how FB functions these days, it takes like some 6 - 7 clicks to deactivate your account when it should be 3 at the least. Notifications are delayed. You get fed posts from your friends that are treated like new but have been seen and are old. Live support is non-existent, they rely on a half-assed wiki portal of their own to go through to solve problems.
Need I also point out, today's Congress is the worst Congress you can have when it comes to talking to technological problems with. Unless the social media platforms plays in their party's favor for re-election purposes, they aren't going to lift a finger to do fuck all about these problems.