I've only played 2 gmes on this site. In one of them, I played Italy, and I originally wanted to ally with Austria. Even though it ended up that Austria, Turkey, and Russia had formed a triple alliance (I guess that is their little strategy for every game), it took them FOR-ever to finish me off. It was terrible.
More importantly, none of them would talk to me. I finally got a word out of Turkey and Russia, but Austria never responded to a single press I sent. It was terribly annoying!
I guess the point is, I learned that people who don't talk (in a normal game) on this site are generally up to no good. In the other game (which I actually won) Germany was my ally, but suddenly stopped talking to me. He decided to not help me into Denmark (I was England) without telling me, so I wasted a turn.
Merely two examples, yes, but I for one will assume that if someone isn't responding to press is against me, and I will focus all of my efforts to go after that person (unless that person is Turkey and I am England..then it'll have to wait).
Think about it, if we were playing this in someone's garage or whatever, and a player was ignoring your press, wouldn't you be looking at his face for signs of treachery?
;)