Web 2.0 refers to forums, social media which was back in 2004 with fb. Web 1.0 was email and browsers back in 1997. Web 3.0 is mobile phones, connectivity, AI.
Yes, it is possible.
1. It's easy if people use posts and thus you can see the date of the first post.
2. Wayback machine, check the date of the first capture (it's not as accurate though as it takes time wb machine to archive it).
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