Earlier quoted context omitted.
Please take a beat to think about how this would be implemented (it looks like it's not decided at this time) before reflexively saying "good" because the marketing sounds nice. This is how the US got swindled into accepting the PATRIOT act, et al. There are problems with social media, yes. However, these problems exist for children and adults. A reasonable way to tackle this issue would be to make social media safer…
There are problems with cigarettes, yes. However, these problems exist for children _and_ adults. A reasonable way to tackle this issue would be to make cigarettes safer for everyone, not just to exclude kids. These problems are not solved with an age check ... You may or may not be acting as an apologist for the sleaziest, worst industry on earth here, but you certainly sound like it, even if it is unintentional. As…
More importantly, smoking is a well defined activity but "social media" is anything but - using your analogy, "social media" can be everything from milk to veges to plain water - all of which you want to ban because they're all sold in the same stores where cigarettes are sold. In other words - starve the kids.
Further, school and legacy media can be more toxic than a well designed social media site for kids - vague bans leave the door open to legacy toxicity while closing it to web-based media that could counter the bad sources.
It's far better to focus on toxicity, identify what is "smoking" and what not, regardless of where the "tobacco" might be hidden. After some consensus is achieved, go after the providers, the same way the tobacco companies were sued onto oblivion.
Why do so many people go after the kids instead of after the providers? Too chicken to take on the big ones?