Seriously? Do you not know how investigative journalism works, or why the press has to protect its anonymous sources, or even what anonymous sources are?!
Using identifying information that "HanA**holeSolo" posted on Reddit, KFile was able to determine key biographical details, to find the man's name using a Facebook search and ultimately corroborate details he had made available on Reddit.
Oh, sry, guess my lack of understanding of what an anonymous source is made me misinterpret that.
Sarcasm aside, the existence of a dedicated effort under the name KFILE is sufficient to hold the title of "Network of informants", even if they are not anonymous. Hell, a "call in line" is part of a network of informants. (You know, something as innocuous as 1-800-crimestoppers). The media uses reporters, who try to get dirt themselves, but the media also uses and enlists the support of other people when doing the investigation for their stories. Some people are better to interview than others, either because they are more tractable for an interview, or because they are in positions to know with authority. It does not matter if those individuals are anonymous or not, they are informants, which is why they get interviewed in the journalistic process. So, I stand by the first part of my shocked reply.
In this instance, a twitter feed called KFILE exists, which is dominated by who I presume to be its maintainer-- Andrew Kaczynski. Being a public twitter feed, anyone can post there, even anonymous twitter users using pseudonyms. It therefor qualifies as a network for informants.
Unless you want to specify how exactly, it is NOT a network for informants, that is.