Google has never been implicated in a plot to hack the U.S. presidential election. Now, I don't actually Believe that the ads displayed on facebook had any real impact on how people voted. They were never on screen for very long, and they took up a small percentage of screen space compared to all the other user and advertiser generated content. But Zuckerberg did testify before congress on live TV and that's what people are going to remember.
Google and Twitter were targeted by the Russians as well. They just didn't go public when they found the evidence, unlike Facebook, until after Facebook did. Facebook bears the brunt in the press because it screwed over the press so much in recent years.
