Mountain View, Calif. - Kosmix, the developer of a search engine that organizes the Web by topic, has raised $20 million in its fourth round of venture capital financing, led by Time Warner Investments.

San Bruno, Calif. - Apptera, a provider of mobile advertising services, announced on Wednesday that it has raised a new $10.5 million round of financing, led by return backers Lightspeed Venture Partners, Alloy Ventures and Walden International.

Berkshire, England - Casual Collective, a developer of social online games, announced that it has received a $1 million seed investment from Lightspeed Venture Partners.

Mountain View, Calif. - Skyfire, the developer of a mobile Web browser, announced on Wednesday a new $13 million second round of venture capital, led by Lightspeed Venture Partners.

Cambridge, Mass. - Greentech Media, an online media company covering green technology news and analysis, announced on Tuesday that it has raised $2.75 million in its second round of venture capital, which was co-led by EGORA Holding and The Massachusetts Green Energy Fund.

Los Angeles - Serious Business, a developer of social media applications such as the "Friends for Sale" game on Facebook, has raised $4 million in a first round of financing from Lightspeed Venture Partners, the Inside Facebook blog reported.

San Francisco - Flixster, a movie-focused online social network, has received $5 million of an $8 million second round of venture capital financing, from Pinnacle Ventures and Lightspeed Venture Partners, PEHub.com reported, citing a regulatory filing.

New York - Outbrain, a provider of ratings and recommendations for blogs, news and RSS content, announced on Tuesday that it has closed a $5 million first round of financing, led by Gemini Israel Funds and Lightspeed Venture Partners.