When I left in 2001, the internet had nothing to do with my moment of clarity at a Sunday WT study, after which I decided I didn't belong and never went back. So it was a 0 for me.
However, after leaving, I stumbled around the internet and read so many stories of people that felt just like I did which reaffirmed my decision was the right one for me.
A newly exited friend of mine did their investigation on the internet, and as was mentioned earlier, got an online copy of COC. I believe what they found on the internet confirmed years of doubt. So I think in this case it would be a 10.
I believe there has to be at least a question, or a niggle of something is wrong in order to even dare research on the internet.