Three days ago, Nude Socialist was probably the first source that mentioned a provocative suggestion.
In the article GPS satellites suggest Earth is heavy with dark matter, Anil Ananthaswamy mentions an unpublished proposal voiced by Ben Harris at a recent meeting of the American Geophysical Union.
Harris determined the Earth's mass from the trajectories of the satellites and his result was between 0.005 and 0.008 percent higher than a figure of the International Astronomical Union. So he decided that the extra mass is due to a 190-kilometer-thick ring of dark matter surrounding the equator because it was the coolest explanation he was thinking about even before he was trying to quantify the mass.
Call me a big skeptic. Harris hasn't incorporated relativistic effects – an omission that produces 10 miles of a new error in the GPS location every day. He has even failed to include the Sun's and Moon's gravitational effect on the satellites' trajectories. He's probably not terribly experienced and even if he were, the discrepancy doesn't seem too statistically significant – at most a few sigma.
Moreover, I have serious problems with his would-be explanation, too. I don't believe that dark matter would create rings above the equator. The Earth's spin is probably a negligible effect for particles such as dark matter. A static spherical halo or rings oriented in random directions would seem more likely to me (the direction of the galactic plane could be preferred).
Even more seriously, I don't understand why this dark matter should reveal itself as a difference between two measurement of the Earth's mass. For example, the Earth's gravitational field affecting the motion of the Moon has always included all "terrestrial dark matter components" as well, didn't it? It's not clear to me why his calculation should "see" the dark matter contribution while the others "shouldn't see" it.
So while I would find some dark matter concentrated around us exciting, I think that this particular line of argument isn't even half-baked. It is almost completely unbaked. An average particle physicist or cosmologist has several such crazy ideas every week – that's millions of similar ideas from the particle physics community every year. The procedure that allowed this particular one to generate a whole article in Nude Socialist seems incomprehensible to me. More precisely, I think that the primary factor is the lack of any quality standards.