Maybe it’s the cold weather. Maybe it’s the approach of Valentines Day. Whatever the reason, compatible firms are hooking up at an alarming rate. First, B2B data compiler DiscoverOrg announced it is buying fellow compiler ZoomInfo. The B2B data space is getting crowded as firms like Radius, DemandBase and LeadSpace compete with traditional providers. You may also recall that Dun & Bradstreet was sold to private investors last August.