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The official Wikipedia policy defines "vandalism" as follows:

“

Vandalism is any addition, removal, or change of content made in a deliberate attempt to compromise the integrity of Wikipedia.

”

— from Wikipedia:Vandalism

This policy is intentionally vague to enable vandal-fighters to deal with any unconstructive edits they find.
Below is a non-exclusive, open-ended list of things that I regard to be irrevocably unconstructive.
If your edit follows the pattern of any of the things listed below, I can assure you I will revert.

Anything listed on Wikipedia:Vandalism as a common type of vandalism.

Any edit to an article that contains YOLO.

Any edit to an article that consists of ALL CAPITAL LETTERS.

Almost any edit that consists of, or has an edit summary with, ALL CAPITAL LETTERS in any namespace (not including short abbreviations or acronyms such as G10, CE, RVV, etc).^[1]

Any edit that consists completely or primarily of swear words.

Any edit that compares someone or something to a body part below the waist.

Any edit that says "Bush is teh gay." or something similar.

Any edit that includes a broad generalization about an elected official. (e.g. XXXXX is the best/worst/most incompetent/whatever)

Any edit whose edit summary lies. (e.g. saying you corrected a typo when you actually deleted half of the article.)

Any edit that personally attacks someone or something.

Any edit that involves a person, place, or thing that is not especially important, or that does not provide enough information to positively identify the subject of the sentence or phrase.^[2]

Any edit, not on a talk page, that apologizes for vandalizing. If you are really sorry, please, just stop.

Any edit that consists solely of text generated by clicking on the buttons above the editing window.^[3]

Any edits that add external links pointing to the same domain to more than one page in quick succession.

Any edit that adds defamatory content to a page without including a citation.

Any edit that uses variants of the word "legend" as a direct object, an adjective, or an adverb.^[4]

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If after reading this page, you still think that I should not have reverted your edit, feel free to leave me a note on my talk page.

When writing, please remember that, as I am a human being, I am not infallible, and I do make mistakes. For best results, write a clear, concise, and civil note. If possible, include the name of the article you are concerned with. Also, please remember to sign your post with four tildes (~~~~).

Swearing, cursing, and/or attacks will simply be reverted and ignored, and they could even get you blocked from editing.

^ Basically, the only time I would not revert is when the edit makes you look so foolish that I decided it is better to just leave the edit so that others may know something about your temperament. You may want to read WP:CIVIL
^ For example, "Alice was here", "Joe's Bar serves great food", "Juan Sanchez recently placed fourth in the 9th Annual Fayetteville 5K Run"
^ For example: '''Bold text'''[[Link title]]''Italic text''<nowiki>Insert non-formatted text here</nowiki>[[Image:Example.jpg]]<sub>Subscript text</sub><ref>Insert footnote text here</ref> and so forth.
^ Anyone who actually is a "legend" will be able to back it up. Provide a citation to a reliable source or be reverted.

See also