Fierce Network Broadband Nation Expo Broadband Nation Fierce Technology Events Advertise About Us Broadband Cloud Wireless Resources Fierce Events Podcasts Surveys Webinar Whitepaper Broadband Nation Learning Center Events Subscribe Broadband Cloud Wireless Resources Fierce Events Podcasts Surveys Webinar Whitepaper Broadband Nation Learning Center Events Subscribe Fierce Network Broadband Nation Expo Broadband Nation Fierce Technology Events Advertise About Us Wireless SPOTLIGHT: Loopt exec leaves for Charles River post Oct 8, 2007 6:59am Loopt's Mark Jacobstein has left the mobile location-based services company for a post at Charles River Ventures. Article