I say they disappeared because, as opposed to 2016, no talking heads on TV were waxing indignant about RUSSIA making Facebook pages and there was no years long investigation into their actions. One or both of these is true:
1. TRUMP! shut them down so thoroughly that the media could not find interference despite feverishly searching for it.
2. The democrat won so the media didn't see any need to dig into it, and really didn't want to rock the boat by finding anything.
Now RUSSIA has people running around with their hair on fire. Obviously, somebody's afraid TRUMP! is going to win again.