Spam is a problem for Wikitravel, whether it is added by a registered user, an anonymous user or a spambot. There is an excellent spam blacklist which could prevent this. However, it is not activated on all language versions.
In order to reduce spam, please activate the spam blacklist on all active language versions. See  for the Mediawiki installation/configuration page for this extension.
Make Wikitravel Shared the source for the spam blacklist, i.e. the latest list where all the language versions fetch their updates.
And, of course, do the same thing for the spam whitelist.
Well no, it is ONE tech request: to enable the blacklist. The second issue, i e Shared as the source, is more of a hands-on routine matter where we have to reach consensus: the first place where a blacklist update should happen is on Shared. From Shared, the language versions copy the blacklist to "their" version manually. I doubt there is an automatical solution (for now). The reason the issue went into the request is to highlight it. Riggwelter 13:01, 10 August 2011 (EDT)
This is in the tech queue and will be implemented soon. Targeting August/September, becasue we may wait until after the Mediawiki upgrade. I will update if I have an earlier ETA.--IBobi 13:20, 10 August 2011 (EDT)
One thing strikes me: is the black list really something that you need to activate in the software? I have a faint idea that I activated it on sv: just by creating the very page together with the guidelines? Perhaps we just need to put the page on ar: and it will work? That means that IB should no have to do something. So, let's just wait for the s/w upgrade. Oh, and one more thing: there should be no items in the tech queue without a ticket on Shared, just so IB and the community can keep track of changes. I expect IB to close the ticket when the solution has been implemented, tested and approved. Riggwelter 13:22, 10 August 2011 (EDT)
We do not need IB to help with this. All that should be needed is to create the page, and make sure the MediaWiki pages are configured appropriately. I have set it up myself on multiple languages. Just create the blacklist page, and then make sure to copy the title to MediaWiki:Spamblacklist. E.g., write "Local spam blacklist" as the sole content of the ar version ar:ميدياويكي:Spamblacklist. (I do not have privileges there.)
Unless there are other questions, this tech request should be able to be closed. --PeterTalk 16:37, 10 August 2011 (EDT)
Thanks Peter - I've nominated myself for admin on ar: and will make this change once the 14 days have elapsed. This request can be closed. -- Ryan 17:53, 10 August 2011 (EDT)
Other than removing it from the Road Map, what needs to be done to close this?--IBobi 20:02, 10 August 2011 (EDT)
Just changing the category below from open to finished. I have taken care of this. --PeterTalk 23:17, 10 August 2011 (EDT)