I'm using Yandex Direct - it is Russian contextual advertising system. We are creating and promoting sites, and started contextual advertising campaign. There were a lot of keywords like "create site", "buy site", smth with "seo" and so on. But there was also keyword "site", without anything. We saw, that a lot of users were searching for something not about site developing, but their queries contained word "site", so they saw advertisement. There were queries like: "russian railway site", "online dating"(in russian it contains word "site"), "site kinder-surprise" and MANY similar queries. Okey, it's understandable, that they saw our advertisement, because keyword for it was just "site". BUT our advertisement has title "site of any level of complexity to order", text was "unique design, seo, open price policy, at least 1200$". I undestand, that it sounds bad in English, it doesn't matter, the essence is clear. SO, main problem was, that A LOT of people clicked on ad. CTR was 5%! We lost decent amount of money, because 5% of people, those were searching for smth like "railway site" clicked on that ad. So, I'm interested - is here any sense to suppose, that something is bugged in yandex? Or this situation is normal? I supposed, that many users open first links in new tab blindfold, when they are searching something. Of course, without separation of ads and search results. But no any other explanation yet...

Sorry for bad English, there is also some Lost in Translation here.. You can ask, if something isn't clear..