New York - Tumblr, the provider of a publishing platform for mixed-media blogs and social networks, announced on Thursday that it has closed a $4.5 million second round of funding, led by Union Square Ventures and Spark Capital.

New York - Boxee, a developer of set-top box software that can deliver Web video and audio content to a television, has raised $4 million in funding from Union Square Ventures and Spark Capital.

New York - AdMeld, a provider of online advertising optimization and integration services, announced on Monday that it has raised $7 million in first round funding from Spark Capital and the Foundry Group, and named Michael Barrett as its chief executive.

San Mateo, Calif. - Adap.tv, a provider of online video advertising services, announced on Tuesday that it has raised a $13 million second round of financing, led by Spark Capital.

Santa Monica, Calif. - Eqal, the production company that created the Internet show "Lonelygirl15," has raised $5 million in its first round of financing, led by Spark Capital.

New York - Inform Technologies, a provider of website content management technology for established media brands, has raised $15 million in venture capital from Spark Capital, a Boston-based venture fund.

New York - A group of investment funds led by Jana Partners has taken a 21% stake in technology publisher CNET Networks (NASD: CNET), and is seeking to oust the company's current directors and take a majority of its board, The New York Times reported, citing people briefed on the proposal. Other entities involved in the proposal -- which CNET has rejected, sources told The Times -- include Sandell Asset Management, Spark Capital and entrepreneur Paul Gardi.

Boston - 5min, a website that hosts "how-to" videos, announced on Thursday that it has raised $5 million in its first round of financing, led by Spark Capital.