Short & Sweet: "What's up"

So here goes... short & sweet!

If you want to have a conversation with me, TALK! Simple right? I thought so too, however, it seems that a lot of people do not have text/IM/etc. etiquette when it comes to initiating a conversation.

If you hit me up and the conversation goes like this:

You: Hey, what's up?
Me: Nothing much. I'm just at ______. What's up with you?
You: Nothing.
Me: Okay
......

And I'm still waiting on you to continue, but you don't... I may have to ignore the rest of your messages from here on out. If you don't have anything to talk about, don't waste my time!