I would bet that more than 99% of what is on line is opinion, rather than fact.
I have no facts with which to counter your claim but I wonder ... is it fact or just your opinion? That said, I'd say (IMHO) that a significant percent is outright BS, much of which is intentional and nefarious-agenda or ideologically driven. We should be teaching our middle schoolers that much of the "info" is bogus and how to know the diff between facts, opinion and outright lies.