Shapr - A completely free way to build your professional network.
Eventtus - Engagement platform for events.
Project Fixup - Meet people, not profiles
ColdInbox - Quickly Send Automated LinkedIn Messages That Convert Your High Value-Prospects Into Leads And Then Customers Without Having to Spend $$$ in Advertising!
Smoothie - Blind dates and hook ups
Event Hunt - Startups and Tech Events Curated By Locals