Rollbacks are easier for admins than non-admins.
Rollback options for Admins
On the User Contributions page an admin has additional "rollback" links at lines which are the last edit made by anybody to that article.
The rollback link is also shown on the Diff page when viewing the difference between the most recent version of a page and the last version.
Clicking on the link reverts to the previous edit not authored by the last editor, with an automatic edit summary of "Reverted edits by X to last version by Y".
If, between loading the User Contributions page and pressing "rollback", someone else edits or rolls back the page, or if there was no previous editor, you will get an error message.
This feature's function is best described by developer Brion Vibber in this posting:
Its intent is solely to be a timesaving shortcut for reverting mass vandalism... No one should ever be in an edit war, sysops in particular should be aware that that's not cool, so there's no need to think about whether or not 'rollback' should be used in an edit war. It shouldn't, because we shouldn't be in that position in the first place.
Rollbacks should be used with caution and restraint. Reverting a good-faith edit may send the message that "I think your edit was no better than vandalism and doesn't deserve even the courtesy of an explanatory edit summary." It is a slap in the face to a good-faith editor; do not abuse it.
In cases of flood vandalism, admins may choose to hide vandalism from recent changes. To do this, add &bot=1 to the end of the url used to access a user's contributions. For example, http://en.wikipedia.org/w/wiki.phtml?title=Special:Contributions&target=SomePersistentVandal&bot=1.
When the rollback links on the contributions list are clicked, the revert, and the original edit that you are reverting will both be hidden from recent changes unless you click the "bots" link to set hidebots=0. The edits are not hidden from contributions lists, page histories or watchlists. The edits remain in the database and are not removed, but they no longer flood Recentchanges. The aim of this feature is to reduce the annoyance factor of a flood vandal with relatively little effort. This should not be used for reverting a change you just don't like, but is meant only for massive floods of simple vandalism.
- http://meta.wikimedia.org/wiki/Vandalbot - MediaWiki discussion of Vandalbots and what to do about them.
- http://meta.wikimedia.org/wiki/Help:Patrolled_edit - An overview of the new "Patrolled Edit" feature.
- http://en.wikipedia.org/wiki/Wikipedia:Revert - Reverting pages for Sysops and non-Sysops.
- http://meta.wikimedia.org/wiki/Edit_throttling - This page, along with its corresponding Talk page, suggests some anti-vandalism features which woul be very useful. We hope this will be made available in a future version of MediaWiki.