CNet claims that Plaxo’s new social networking initiative called Pulse is more like Pownce with its micro-blogging / tumbing / twittering features.  I’m not so sure.  The fact you can leave notes behind is hardly the providence of Pownce (although with its finely tuned “who your message goes out to”, I suppose it is).  Once upon a time notes left behind in reverse chronological order were called blogs.  But I digress.  The mishmash of notes, your ability to leave messages on other members, and your ability to pull in feeds from anywhere really sounds like Facebook rather than anything else.  From Plaxo’s point of view, I’m sure whatever makes their users more social — and therefore, get more out of it, is probably A Good Thing.  For more on why the “social” in social networks is a good thing, see why Jeff Pulver has left LinkedIn for Facebook.  Will this herald a change of more “business” social networks to be more “social”?  Time will tell.