Extensive investigation into vaccines and autism has shown that there is no relationship between the two, causal or otherwise, and that vaccine ingredients do not cause autism.
Neutral. Wikipedia does not give undue weight to fringe theories not supported by reliable sources, like the idea that vaccines cause autism. This passage is an appropriate summary of the scholarship on the topic.
Not neutral. This sentence is true (modern flat Earth beliefs are indeed growing), but this phrasing is highly misleading as it leads the reader to think that there is substantive disagreement about the shape of the Earth. In reality, reliable sources have an overwhelming consensus on the shape of the Earth, to the point where the spherical Earth perspective is treated by Wikipedia as fact, and the flat Earth perspective is considered WP:FRINGE, meaning it generally need not be mentioned.
Michael Phelps (born June 30, 1985) is an American former competitive swimmer and the most decorated Olympian of all time with a total of 28 medals. He has encountered legal trouble on several occasions. At age 19 in November 2004, he was arrested for drunk driving in Salisbury, Maryland. In February 2009, a photograph of Phelps using a bong went viral; this resulted in the loss of the Kellogg Company as a sponsor and a three-month suspension by USA Swimming. In September 2014, he was arrested again, this time on charges of drunk driving and speeding in Baltimore, Maryland.
Not neutral. An article should not give undue weight to minor aspects of its subject. While Phelps has indeed encountered legal trouble on several occasions, it would be inappropriate to devote such a large portion of the opening paragraph of this article to those occasions.
Not neutral. Calling something the greatest is an example of peacock language, in this case expressing an opinion that can't be supported by reliable sources. You should show instead of telling, using verifiable facts; it would be much better to instead write The New York Yankees have won 26 World Series championships—almost three times as many as any other team.
William Shakespeare is widely considered to be one of the greatest authors in the English language.
Neutral. This is a proper description of a reputation. Crucially, it is only valid because many reliable sources have actually stated that Shakespeare has this reputation. The phrase widely considered is important – while it is a fact that he is considered one of the greatest, it would be an opinion to directly say that he is one of the greatest.
Cats received negative reviews from critics, who criticized the CGI effects, plot, and tone, with many calling it one of the worst films of 2019.
Neutral. Wikipedia describes reputations, indicating the relative prominence of different viewpoints. When reputations are bad, Wikipedia should say so, without employing false balance.
For example, Critic A reviewed Cats positively, praising X, while critic B reviewed Cats negatively, criticizing Y is verifiably true, but still not acceptable as it isn't neutral. Writing that would be false balance, as it inaccurately summarizes an overwhelmingly negative critical reception as if it were evenly mixed between positive and negative reviews.
In 2017, Facebook partnered with fact-checkers from the Poynter Institute's International Fact-Checking Network to identify and mark false content, though most ads from political candidates are exempt from this program. Critics of the program accused Facebook of not doing enough to remove false information from its website.
Neutral. This is a good example of how to note that a prominent point of view exists (appropriate) without taking that point of view in Wikipedia's voice (inappropriate). A non-neutral wording might look like this: Facebook is falling short of its duty to fact-check the content on its website, it should do more.
Not neutral. This phrasing puts these ideas side-by-side, presenting the Holocaust as a matter of opinion rather than historical fact. This is not neutral because David Irving's position of Holocaust denial is a fringe viewpoint that should not be given equal standing with the consensus among respected historians.
When discussing David Irving, a neutral phrasing might look like this: The Holocaust was a program of extermination of the Jewish people in Germany. David Irving is a Holocaust denier, meaning he holds the false belief that the Holocaust did not occur.
Princess Diana died in a Paris hospital in 1997 after being injured in a tragic car crash.
Not neutral. Even though her death is almost universally considered tragic, putting in the word tragic like this is still an inappropriate instance of orializing. Instead, use facts to convey the public response, such as Media attention and public mourning were extensive after her death, and an estimated 2.5billion people watched her televised funeral.