People see what they want to see in it, other people see it causing divisiveness where you see it causing conformity. It will take us decades to understand the effects.
We're in an interesting time right now, when at least 50% of people in first-world countries remember a time before the internet (obviously higher in countries with less internet adoption)
In 70 years, everyone alive will have grown up in a world where the Internet was everywhere.
There's definitely pros to this as instead of having to hide things like your sexual orientation in your community due to bigotry you can go online and find others like you. There are also cons abound, where instead of (for example, not trying to push policy here) ranting about how nobody rides the bus and encountering your neighbor whose car broke down and is riding the bus you instead go online and talk to other people who think buses are stupid.
No it will take time to characterize the effects. Today we know exactly how and why it was designed.
Ps. HN is also an echo chamber but here readers are more keen to ask questions.
Although I’d agree if you are referring to secondary effects — they will take a little longer to manifest. But we are certainly seeing some of those already.