Respose to a "Hi"

There's no dearth of mails/scraps that one gets with the subject "hi". It gets even more painful when that's all the content that there is. And I'm left at my wits' ends trying to figure out how to respond to such mails/scraps. Though I'm not overly social, I still want to respond so that I don't sound rude. But the point is what?

My interpretation of "hi.. wassup?" is: "I don't know what to write. But still I want to write. So, here's my mark". Now, I don't know how I could respond to such a scrap. Some options I ponder over are:

1. "Listen dude/dudie, I understand that you have had nothing to do and want to see some movement on your orkut scrapbook. But I'm not nearly the correct person. Try someone else and you might actually strike a conversation out of thin air."

2. "Do you know that you can self-scrap on orkut? (Yes, really, I've tried it.) Why don't you self-scrap?"

3. "See, I hardly even remember who you are. Accepted that we might have spent a wonderful evening one day but come'on."

4. Respond back with a "hi" or "hello" or a similar monotonic salutation (essentially throwing the ball back into his/her court)

5. Give a pointer to my blog

Acts 1, 2 and 3 are overly rude. Act 4 doesn't have a purpose, other than symbiotically incrementing the scrap-count. Act 5 requires that I update my blog regularly, a condition almost never met.