Reader. Exchange ActiveSync. Voice app for BlackBerry. Google is on a closure tirade in the last few months, and the trend continued with a Monday announcement. The company will discontinue its site-blocking service for Google search results. Soon, users will no longer be able to log into their Google accounts and set search to exclude certain sites from results. Hello again, Yahoo! Answers. Welcome back, Wikihow.

According to Webmonkey, the tool was originally intended to filter out content farm spam from sites like livestrong.com or Associated Content. But the feature has fell into some disuse since its introduction, and Webmonkey states that it even stopped working for a spell.

Google created a Chrome add-on that replaces the site-blocking functionality, but this obviously requires users who want the feature to use Chrome in the first place. The add-on also filters sites client-side rather than server-side, so users may occasionally get flashes of unwanted results within their searches.

While the site-blocking service is not quite as vaunted as some of the shutdowns Google has mounted recently (rest in peace, beloved Google Reader), we’re sure it will be missed by certain parties. Avid users can download their list of blocked sites as a text file.