This looks like a handy web app, or the term that I'm seeing used, SAAS - Software As A Service. I prefer the term "web app" and hope that it sticks and prevails. Spread the good word, let's crowdsource this one into mainstream venacular.

As for Postling, from what I can tell, this is a one-stop place to update your multiple social media outlets / social networks. Functionally comparable to ping.fm, pixelpipe.com, hellotxt.com, tarpipe.com. Plus, 2 new ones in beta (at time of this writing: updating.me and atomkeep.com.

How would you decide between all of these? Try them out, see which is most intuitive and easy for you to use, and which one updates all the social networks that you'd want updates to go to. Not all of them update the same social networks. The two most popular social networks, obviously, are Facebook and Twitter. And for professionals, also LinkedIn.