AFAWK, JIRA is tasks for R&D, period.
daPulse is a collaboration tool, so R&D, design, marketing, management - everyone in the company uses it.
It is a bit like you described, PM + social + tasks, but it's designed to help everyone focus on the 'big things'. What it really does is gives everyone in the company one unified view of top priorities, so everyone's in focus on what's important and it gets everyone collaborating with zero e-mails.