Let's say you have 2 opposing POV: A or B
"A" has a silent majority so only 5 of the 5,000 people post a comment about A being the right POV.
"B" is a passionate minority so 5 of the 50 people post a comment about B being the right POV.
To the viewer, it looks like a balanced discussion and a topic open to much debate, both sides have equal voice but in reality "A" is by far the most accepted position.