What is the most innovative invention in for decades?

I think the Internet is the most innovative invasention.

Invasion is a war — not the word you’re looking for

It has been spreading very quickly and changesd the world completely for better or worse.

What is the most innovative invention in for decades?

What is the most innovative invention in decades? =in that amount of time. This question focuses on the quality of being innovative.

What is the most innovative invention for decades? = for that amount of time. This question focuses on how long the invention has been innovative.

I think the Internet is the most innovative invasention.

If this is an error, it's kind of funny because you could certainly say it has been the most innovative invasion!

It has been spreading very quickly and changes the world completely for better or worse.

Sounds like an invasion to me lol

For mePersonally, I’m very glad to connect with someonpeople on the Internet through a site like this site.

There is nothing wrong with "someone," but it sounds more natural to say "people." It is also more accurate because we interact with more than one person on this site.