It's impossible that there's any other explanation--if you read his column, you will see that's all it could be. I've seen Facebook bury things. I know they do it--they've admitted they do it. They buried his page's reach--they do it all the time to conservative pages.
Impossible? Nope. Just because the likes went down is not evidence of facebook manipulation. There is no ground swell out there for impeachment so I am not surprised. There should be but there isn’t.
What is needed is to get conservatives IT types to work for facebook and get inside and gather real evidence and expose them.