Do you have any evidence to support this, or can you suggest steps that one might take to replicate your experience and so help to confirm your suspicions?
What you can do is this:
Look for the comments in areas where the articles talk about Apple, Microsoft etc..
Look for the vote tally's (Hidden comments will have the same downvotes) +/-(3-6votes) as the next comment. (next comment has similar votes that are upvoted).
You will notice the hidden comments in these type of articles are usually enough to warrant investigations themselves.