Translations:Manual:$wgAllowExternalImages/24/en

An image URL added for this purpose, is an abuse of your wiki, which (unless you disallow it) you will need to look out for along with more conventional Wiki Spam attacks. Note that the actual image could be a miniscule 1x1 pixel images, and so as with wiki spam, you won't necessarily see it on the page itself, but you will see the edit on your 'recent changes'. Conventional Anti-spam features (such $wgSpamRegex) will counter these kinds of URL along with normal link spam.