Hubspot Marketing Leads netFactor PR 
WebMarketCentral
DECEMBER 8, 2008
These vendors are quick to point out that you've already paid for the traffic to your site through PPC, SEO, interactive PR , banner advertising or other activities; their services simply help you learn more about the 97% of visitors who don't immediately convert into a lead.
Online Marketing Institute
JULY 31, 2009
The problem is: these platforms are heavy on campaign design, execution, and reporting and light on lead management. Recently, I’ve heard from companies like Bulldog Solutions, InsideView, Jigsaw, netFactor, Reachforce, PointClear, Genius, Leads360, among others. 2) Email services – Julie Katz at Forrester writes about this group.
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