Yes, and not only here obviously. The subject is covered very well IMO in wiki and on Youtube. I think if it was not a terrorist attack but something else entirely we'd already know it for sure. It's impossible to hide something that's so important in the modern world.
Millions of people 'know' with pretty high precision what 9/11 was all about and how it went down. Many millions more know that the official story is false to one degree or another.
If your metric for gauging who 'knows what for sure' is based on what Snopes says, you will be forever behind in understanding the world.
Put another way, 'consensus' is an extremely poor substitute for knowledge, and that has probably never been more true than today. Humans are by nature closer to herd animals than they are to solitary hunters. People who are competent at social engineering understand this and leverage it to their advantage.