I decided to quickly chart some data about user growth that Path has pushed out recently:
November 10, 2010: Launch of Path 1.0
June 1, 2011: Path hits 500,000 users
October 20, 2011: Path hits 1M users
November 29, 2011: Launch of Path 2.0
February 3, 2012: Path hits 2M users
June 1, 2012: Path (almost) hits 3M users
Path went from zero to 1M users in 247 days, showing that they received about 4048 downloads per day during that period. Path went from 1M to 3M users in 119 days, showing that they now grow by about 16,806 downloads per day. Path 2.0 seemingly resulted in a good 4X increase in user growth.