Most articles, if not all, have a layer of influence from the writer. Even something as simple as a top 10 list includes some bias. The bias exists in what the writer excludes and includes in the article. Even what I'm writing right now has some bias in it. Instead of saying "Even something such as a top 10 list" I said "Even something as simple as a top 10 list".
Anti-Facebook? More like pro-pageviews!
And yet it's very positive about Facebook's upcoming timeline?
It is to preserve the plausibility of an unbiased viewpoint.