Bitly, the social bookmarking and discovery service, has raised $15 million in what it characterized as a strategic round of funding led by Vinod Khosla at Khosla Ventures.

Social business platform Nimble secured $1 million in funding from Google Ventures and a list of angel investors that includes Dallas Mavericks owner Mark Cuban, Jason Calacanis, Don Dodge and Dharmesh Shah.

On a day when President Obama’s visit paralyzed much of Hollywood’s traffic, Facebook has filed the paperwork to form its own political action committee. Reports also surfaced Monday that Facebook had registered the domain names FBPAC.org and FBPAC.us. The social media giant has had a voice in Washington D.C. for the past few years, but this is the first time it will be able to support specific candidates through direct financial donations. Facebook spent $207,878 on lobbying activities in 2009, $351,390 in 2010, and $550,000 in the first half of 2011, records show.

Hollywood and Silicon Valley types have joined forces on Amplify, a mentor-driven startup accelerator and entrepreneurial campus in Venice, Calif. backed by a $4.5 million fund.

Cloud communications company Twilio has raised a $17 million Series C round of funding from returning investors Bessemer Venture Partners and Union Square Ventures.

San Mateo, Calif. — InMobi, an independent mobile ad network, has acquired Sprout — a company specializing in HTML5 based ads — to enrich...