Generally, tabloid magazines are filled with sensational stories about celebrities and public figures. Most of the stories are either made up or exaggerated. It is almost impossible to find a reliable tabloid magazine.
Newspapers have editors who can accept, modify, or reject the stories that they receive from journalists, therefore, journalists can only promote their own bias as long as they have an editor who will let them do that. There is an additional corrective mechanism, which is that if the general public is offended by the bias of what they read in a newspaper, they may stop buying it. Although in practice, the bias of a journalist may turn out to be popular with readers who have a similar bias, so it can be an economically successful feature.
Well the answer is actually quite difficult, when a News Writer is looking for information its not how he got the information but when and where he got it.
Needs to grab the audience
other news sources.
Libel