[kartan]

2010-07-19 12:00:00 co-worker: Hi

2010-07-19 12:00:30 me: Hello

2010-07-19 12:10:00 co-worker: I have a question about Facebook. Are you the right person to ask?

2010-07-19 12:10:25 me: May be. What's your question?

2010-07-19 12:20:25 co-worker: I want to know ...

2010-07-19 12:21:10 me: No, sorry. For that, you need to contact ...

Fast version:

2010-07-19 12:00:00 co-worker: Hi. I don't know if you are the right question, I want to know ...

2010-07-19 12:01:10 me: Hello. No, sorry. For that, you need to contact ...

[pvinis]

So basically just skip hitting Enter..

[zamalek]

As well as sitting there waiting for the person to type their next message.