Have you ever questioned the validity of some of your memories? Have you ever really considered what it would be like to be the last human on the planet? Does it bother you when someone watches over your shoulder while you’re on the computer?

These are just a few of the more popular questions being asked and answered over on wis.dm, which describes itself as “a place to engage around asking, sharing, growing and learning. It’s where you get to question everything.”

It’s an interesting diversion, to be sure. You have to register to be able to post, and you get points for asking and answering questions. Yes and no answers can be provided in one click, like rating a movie on Netflix, but you can also elaborate by adding comments.

Does the Internet really need yet another social networking site? I asked the question on wis.dm; ironically, the response is running about 2-1 against.

About a year ago, I blogged about how Pay Per Post was a bad idea. Here’s a pretty complete list of mostly similar bad ideas.

Takeaway for marketers: On the Internet, pimpin’s easy.

I was interviewed last week for this ClickZ article, but my quotes were left on the cutting room floor. No biggie, except that probably the most important point about marketing in virtual worlds got left there, too. Thankfully, though, Jay Goss of Numedeon (creators of Whyville) and Ian Schafer of Deep Focus touched on it in the piece.

“Unless you understand the behavior of the people in that virtual world you are going to come across as disingenuous or inauthentic,” Schafer correctly says. Goss takes it to the next step, noting that it’s important to give virtual worlders “something to do while interacting with the advertiser’s message, as opposed to passively receiving the advertiser’s message.”

Exactly. It’s all about what the inhabitants of the virtual world want to do, not about what the company wants the inhabitants of the virtual world to do.

Takeaway for marketers: If you’re an advertiser getting involved in virtual worlds , you need to be asking, “How do I best enhance someone’s online experience?” before asking, “How do I best slap my ad somewhere in that world?”

Yesterday was remarkable: Two billion people worldwide hooked up via Live Earth. It was an enormous global event designed to raise consciousness and discussion about a significant human and political issue.

And there they were: The Pussycat Dolls shaking their asses and singing, “loosen up my buttons, baby.”

Dali never could have imagined this level of surrealism.

Today is Live Earth day. Here’s the official Web site. There’s also a pretty robust Live Earth presence over on MSN (sponsored, somewhat ironically, by Chevy).

Web 2.0 mavens will be interested to note that one of the supporting partners is Twitter; check out what they’re up to over on the Live Earth partners page.