Except some of the polls showing Trump behind are from Fox News.
When Fox has a recent poll that shows Clinton is ahead by 6-7 points (depending on whether it's a 2-way poll or 4-way), well, I really doubt they're carrying water for Clinton.
And you have to understand... there's a certain percentage of the voting populace that is going to vote for the Republican candidate no matter who it is or how they are presented (good, bad, indifferent). There are likewise going to be a certain percentage of voters that are going to vote for the Democratic candidate no matter who it is or how they are presented (good, bad, indifferent).
It doesn't matter what scandals dog those candidates, they will always get a certain percentage of the electorate.
The trick is appealing to those who normally fall into one party or the other but don't care much for the candidate AND getting voters who class themselves as "independent".
Unless something causes an inordinate number of voters from one party or the other to stay home, it is generally impossible to win the Presidential election with just the voters that you can automatically count on. You have to attract voters from outside those blocks.
And Trump hasn't been doing so.
Sure, he's gotten a few. Can't argue that. But he's spent so much time actively insulting blocks of voters that he's effectively reversed the inroads that the Republican party started making among (for example) Hispanic voters after Romney's defeat in 2012. Not to mention African-American voters, some Jewish voters, some Asian voters....
He's trying (whether he means to or not) rely on the angry older white voter, and hey, he's gotten that block fairly well nailed down. But it's been at the expense of every other block of voters that he would need to win.
The "easiest" path for a Trump victory in two weeks is to carry every state that Romney won in 2012 and then flip enough states to make up the 64 electoral votes that Romney fell short of.
The problem there is that not only is Trump apparently failing to do that (it's unlikely that he's going to flip Pennsylvania or Florida, and Ohio might be out of reach as well), it's possible that he's going to lose some of the states that Romney won. He might lose Arizona, he might lose North Carolina. Hell, he might lose Utah.
Facebook and other social media don't need to do anything to make Trump look bad. They just need to give him a forum, and Trump will do that himself.