I don't think so. Because like I said I had only 1.3 million links a year ago. I don't think they would hide 15 million links.
All links are dofollow. And none of them are affiliate links. They all link to my homepage or inner pages.
WMT says that, 4,400,000 links are from one social network. That social network though uses subdomains for their users.
Also I think been pretty authoritative for a few years now. For example I could rank top 3 for various long tail keyword variations that deal with any topic almost.