You can have two particles in an "entangled" state*, and you can show that they do indeed pass information to each other nonlocally (that is, instantaneously). Do a Google search on the EPR Paradox if you want to find out more. However, you can also show that the information is concealed in quantum randomness. The states of the two particles are correlated, and if you look at measurements of a large number of such systems, you can see that they must be communicating, but there doesn't seem to be any way to modulate this in a way that would allow you to communicate.

As an analogy, suppose that you and I each have a magic coin, and if we toss the coins at the same time, they'll always land the same way, no matter how far away we are from each other. But flipping one of the coins over manually doesn't affect the other one at all. It's only if you toss them randomly that they match. So if we compare tables of results, we can see that the coins are "talking to each other" faster than light, but they won't let us use the same mechanism to do so. That's more or less the way these correlated states work.

* Technically, any two particles that have ever interacted can be considered entangled, so this argument pretty much applies to all the particles in the universe. The issue has been described in terms of certain stronger levels of entanglement for which this behavior is easy to calculate, and which has been experimentally verified. So it's kind of like all the particles in the universe are whispering behind our backs, but they won't let us in on the conversation. Seems like a grand joke of the universe to me.