Call of Kamina
The Children of Kamina employs a widespread network to gather information and attempt to prevent any information about the Old Ones from reaching the public.
Besides the main base in Arkham, and the subsidiary in London, the CoK has outposts in most countries. There is also a dedicated monitoring post in Antarctica, due to several incidents stemming from that continent.
The internet has been a godsend for the CoK, making it easy for everyone to send crappy images and videos. This makes the few real clips and images that leak out easier to debunk. The CoK itself even occasionally circulates slightly doctored images of real events, to make it easier to pass the leaks as fakes. The CoK invests heavily in digital photo editing software, such as Photoshop, and funds the development of these programs, making it even easier to erase evidence.