Social Networking Sites and e-mail harvesting

It must surely be every spammer's dream come true.

On Orkut, a social networking site, I noticed in some of the special interest forums, a person would post a message which would be similar to:
"I have this . If you want it, reply with your e-mail id to this post."
(On one forum I saw such postings, wherein the person promised to send a mp3 file of an advertisement which ran on TV years back.)

And all the people interested in receiving a copy of this file would post their e-mail ids ! What a way to harvest some email ids, if a spammer uses this idea.

People posting their email ids openly, beats the system of being able to control who can view the email ids which has been incorporated in Orkut.

People......!!

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