WTF is this Plaxo crap?

I just received a message from some social networking crap called "Plaxo".

Subject: John added you as a connection on Pulse I'd like to connect to you on Pulse. Pulse is the easiest way to stay up-to-date and share photos, contact info, recommendations, or just about anything from the sites you already use (YouTube, Flickr, Digg, etc.) with the people you know. Thanks, John To accept this request and see what I'm sharing: http://pulse.plaxo.com/pulse/invite/?<removed tracking code> Though member-sent, this e-mail contains promotional content. If you would prefer not to receive such mailings in the future, click here. Plaxo's office is at 203 Ravendale Drive, Mountain View, CA 94043.

So someone who is only identified as "John", and I don't know many of those wants to connect with me in some vague social networking bollocks? And to opt out I have to follow their process to stop receiving their spam?

Spam! At least Facebook lets you permanently opt out with a single click. These guys, I have no idea who they are and don't care. I won't be following their multi-step process for "opting out" (or rather, verifying I'm a real, live human).