Paying for search sounds off, but Google's decline made it worth every penny.

Swedish startup Twingly is going public with its blog search engine, which is being built to deliver spam-free search results. For the last two months, Twingly.com has been available as a closed beta.

Google is testing showing ads within the organic (free) search results. Generally, Google would show the ads at the top of each page set, even within the continuous scroll interface. But now Google ...