A bunch of people are getting email from a new social networking site called Quechup. Unfortunately, as with some other social networking sites, if you sign up for Quechup and tell it to search your email address book, it automatically (without telling you) sends email to everyone in your email address book, asking them to sign up.
So beware of Quechup. I recommend not signing up for the service at all, but if you do, I very strongly recommend not giving it permission to look through your address book, because as soon as you do that, it'll spam everyone in your address book.
Note that some other sites have been known to do the same thing. When you're considering signing up for a new social networking site, always do a web search to see what other people are saying about the site before you sign up.
I initially wrote a little rant about how people should never send email to everyone in their address books 'cause chances are you've got business associates (like, say, editors you've submitted to) in your address book. But now that I see that it was unintentional, I'll just say to be careful around social networking sites.
And be particularly careful around Quechup.