On: Men who helped run Megaupload sentenced to prison ...

[fluoridation]

I think what the GP means is that "megaupload" is easier to search in a search engine than "mega", with the latter being more likely to return irrelevant results first.

[causi → fluoridation]

No, just that there a lot of searchable index sites that maintained huge lists of URLs for material on Megaupload.