The thing is though, some of these are ridiculous. 9.6 fewer seconds at parties? 6 fewer seconds at cultural events/institutions? Well, I don't party for one (it's a waste of time, and I'm an introvert), and what is a "cultural event/institution?" There's few museums near here, the university theater has few interesting plays, and I likely wouldn't go to them anyway. Maybe I'm lacking an adequate amount of culture, but the only museums that really tickle me in my happy spot are air and space museums (with a few notable others touching on such subjects as archaeology or anthropology)...
As tokenizer pointed out at the top of this thread, less time shopping doesn't imply people aren't shopping. It could imply they're supplanting their shopping with online shopping, which is often more convenient. Depending on where you live, online stores might even have a better selection!
I can think of a few falsifications, borrowing from yourself, tokenizer, and several others. 1) Instead of partying or socializing, some people are more apt to replace that with playing games with friends online and using VoIP clients (TeamSpeak, Skype, etc). 2) Instead of spending "other" leisure time watching telelvision or the like, it's supplanted by browsing or gaming. 3) Can you even prove that spending Internet-related time isn't someone's idea of relaxing? Moreover, how do you quantify "relaxing?" Does the notion of what constitutes relaxation change from person to person?
Personally, I'd personally rather if someone were to waste an evening reading Wikipedia than watch television, so I'm not sure how one could quantify "36 fewer seconds on educational activities." This is doubly true for those who use the Internet as a means to further their own interests (the article almost implies they're mutually exclusive).
The other question is thus: Does it matter?