Topsy raises another $15M for real-time search

Some of the excitement around real-time search seems to have died down recently — I’m no longer seeing hordes of startups embracing the term, and some of the most prominent companies that were active in the space have refocused. But investors still seem to be optimistic about San Francisco startup Topsy, which just announced that it has raised $15 million in a third round of funding.

OneRiot tries new way to find what's hot on social networks

Real-time search engine OneRiot is trying to offer a richer alternative to Twitter’s trending topics with a new engine that analyzes hot keywords suddenly emerging among thousands of status updates from social networks. It will work with its business and distribution partners to send them the right kinds of trending topics to match their needs.

Who rules real-time search? A look at 11 contenders

Real-time search engines have proliferated over the last month, with a series of launches from start-ups like Topsy, and Scoopler. The companies are hoping to edge in on a space that Google co-founder Larry Page has admitted is a weakness for the search giant. And they’re using microblogging and social bookmarking sites as tools to figure out what content is relevant up to the second.