Abstract: In addition to offering employers an opportunity to advertise their job openings online, the online job boards provide tools that facilitate online job application and job applicant screening. In this paper we examine the online job boards’ potential to improve matching between workers and employers. We start by documenting that the size of online job boards has increased considerably in the U.S., Canada, and Europe. Drawing on descriptions of job openings we collected from an online job board Monster.com between 2004 and 2006, we find that: a) the online search tools offered by Monster.com for free are more likely used by employers who indicate active engagement in search or have access to a better online search technology; and b) holding observable vacancy and employer attributes constant, employers who use the search tools tend to keep their job openings online for a longer period of time.