Board Thread:Support Requests - Community Management/@comment-25151790-20150420074121/@comment-303594-20150420075845

I think you can request that the content is hidden from WikiActivity, and staff can add that flag.

A better solution might be to consider banning referral codes altogether. Surely the people who visit your wiki are mostly people who already play the game, so any benefit of referral codes would be small to non-existent.

For more fine-grained control, you might want to try Special:RecentChanges.