Topsy today launched a new video search engine that surfaces hot videos shared on Twitter, revealed the company's official tweet.
The new video search functions similarly to Topsy's other search tools -- web (links), tweets and photos. Results appear to be ranked based on several factors, including how often, how recent, and who shares the video on Twitter. The left column offers a number of filtering and sorting options.
Topsy is not the first real-time video search engine around. TweetMeme continues to offer video search, and OneRiot used to offer it, too.
But, with many real-time search engines struggling and/or shutting down altogether (i.e., Collecta, CrowdEye, and others), Topsy may eventually become the default and even the last real-time search engine standing.