Dachis Group, a “social business design” agency led by former Razorfish CEO Jeffrey Dachis, has acquired London-based social business consultancy Headshift Ltd. Dachis is moving quickly to expand, after launching with a team of “A-list” partners including former Forrester Analyst Peter Kim, former Nielsen Online VP of Measurement Science Kate Niederhoffer and Logic + Emotion blogger David Armano.

This is the second high profile move by a social focused agency in the past week. On August 27th, former Forrester analyst Charlene Li announced the additions Deb Schultz, and former Forrester analysts Ray Wang and Jeremiah Owyang to her recently formed Altimeter Group. Needless to say, Forrester is looking for replacements.