During the past four months we’ve seen not one but two well known real-time search engines disappear. First there was OneRiot, which in October 2010 decided to focus on advertising. More recently, Collecta closed it’s real-time search engine and API to focus on alternative real-time products. Digging further into real-time search offerings you will also discover that crowdeye has also decided to pull its real-time search engine. This now appears to leave Topsy, a OneRiot partner, and of c...