Online ad agency Definition 6, fresh from raising roughly $15 million in private equity last month, has bought digital production and marketing firm Creative Bubble. The amount of the deal wasn’t disclosed. The combined entity will have about 100 employees, and will give Atlanta-based Definition 6 a New York office, thanks to Creative Bubble’s location. That will help Definition 6 gain a more national presence, says CEO and founder Michael Kogon in a post on the company’s official blog. Definition 6 also says it plans to “invest in talent,” and to build up its technology and other services, about 8 months after it laid off several staff members. Release