There are several niche social network platforms that allow recruiters and sourcers to find people other than LinkedIn. One of those is called “Network After Work“. They have a website but they use a third party site/app call Bizaboo to host their data.
Network After Work hosts networking events in 85 cities across the U.S. and they encourage attendees to create a free profile for themselves in the app which is also available via the web. Here’s what the search interface looks like;
Their target market is 5 million business owners and “career-minded professionals”. I have attended a few in CT and NYC and you can meet job seekers in a variety of fields.