Notability is in the eye of the beholder. I look at them both as notable products. Brad Pitt and Catherine Zeta-Jones are notable to a certain set of people. H

Notability is in the eye of the beholder. I look at them both as notable products. Brad Pitt and Catherine Zeta-Jones are notable to a certain set of people. However, they are probably not notable to a large swath of South American tribespeople or even the 7+ billion people on Earth at large. This doesn't mean they aren't notable people in certain contexts. Now, once again, Marco is writing an article to his audience, and his audience is aware of Tumblr and Instapaper and they find those products notable. It's notable to his audience. Is this really that hard for you to figure out? Or do you have some personal anger/beef with Marco?