For example, last night I
posted this screencap of the Rocky Mountain News' Web site once I got home and immediately
got into this conversation.
Click on the second link, then click on "Show Conversation" in the first message to spread it out.
My point is, if you treat it solely as "What are you doing," that's all you'll get in return. Plus, some people think you have to catch up with every single tweet to stay active. It'd be simply impossible to do so. There are ways to catch up with certain people should you want to do so, but if it's important enough, somebody will let you know. You come in when you can, share what you know, engage in conversation and leave when you're done.