Zmags, a Boston-based provider of technology for designing rich media advertising campaigns, has raised $7 million in a round of venture capital, the company announced on Tuesday.

Pyxis Mobile, a Waltham-based provider of technology that helps businesses build and manage mobile apps, has raised $17 million in a round of venture capital, and changed its name to Verivo Software.

BuzzFeed, which aggregates content being shared socially, has raised $15.5 million in a round led by New Enterprise Associates (NEA) with participation from Lerer Ventures, Hearst Interactive Media, Softbank and RRE.

Entrepreneur Shawn Carter, better known to his millions of fans as the 13-time Grammy Award winning musician Jay Z, has invested in Duracell Powermat and signed a multi-year global agreement to be the face and voice of the Duracell Powermat JV.

Trapit, which delivers relevant content dynamically tailored to each individual user, has closed a $6.2 million Series A round of venture funding led by returning investor Horizon Ventures of Hong Kong.

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.

Millennial Media, the Baltimore-based developer of an independent mobile ad platform, late Thursday filed with the Securities and Exchange Commission (SEC) to raise up to $75 million in a proposed initial public offering (IPO).

Aeria Games, a destination site for free-to-play online multiplayer games, has acquired free-to-play online gaming portal ijji Games from NHN Corp. Aeria Games also received an undisclosed financial investment from NHN and advantages for publishing NHN online games.

Washington, DC – Contactually, a DC-based startup led by Zvi Band, the co-founder of ProudlyMadeinDC and DC Tech Meetup, has launched an online dashboard for managing email contacts, relationships and actions.