Elliott C. Back: Internet & Technology

Today’s post by Robert Scoble on the earthquake that rocked China brings out an important distinction about the nature of a distributed messenging service like Twitter. Scoble eulogizes over the speed of information delivery in his post, thrilled that he knew about the earthquake 50 miles from Chengdu three minutes before anyone else did:

I reported the major quake to my followers on Twitter before the USGS Website had a report up and about an hour before CNN or major press started talking about it. [...] Several people in China reported to me they felt the quake WHILE IT WAS GOING ON!!!

While this is a great leap in keeping the world informed about what is going on in any part of it literally at the speed of light, what Twitter does is let you share perception and opinion with the rest of the world. This is different than sharing facts about what is going on. For example, the USGS report which came out three minutes after Chinese citizens began twittering that there was seismic activity, is full of precise details:

Magnitude: 7.9
Monday, May 12, 2008 at 06:28:00 UTC

Location: 31.099°N, 103.279°E
Depth: 10 km (6.2 miles) set by location program
Region: EASTERN SICHUAN, CHINA
Distances 90 km (55 miles) WNW of Chengdu, Sichuan, China
Location Uncertainty: horizontal +/- 5.8 km (3.6 miles); depth fixed by location program
Event ID: us2008ryan

If you look at Robert Scoble’s twitter stream, what you get instead is a succession of misinformation, subsequent corrections, noise, predictions of doom, and frenzy:

• 06:37:49 – @dtan just reported an earthquake in Beijing. Wonder how large it is?
• 06:40:50 – @keso reported earthquake too. @dtan said it lasted 10 seconds. I’d guess it’s a 4.5 then.
• 06:41:21 – @michaelrice says it was a 7.8.
• 06:44:14 – @gaberivera says it’s 57 miles from Chengdu, which has 11 million residents.
• 06:57:46 – @jwalkerjr says to hold off on predictions. Well, I need to pass along my experience with earthquakes. This is a HUGE one.
• 07:15:20 – @casperodj just said it felt like the earth was going to split. Literally everything was shaking.
• For more just wade through the mud…

To his credit, you can get an impression of the event, as seen through his and others’ eyes. You can get an idea of the scope, and the impact it has had on people around the world. But, you can’t get trustworthy facts from listen to what the general public is saying in the face of a disaster. A calm rationality is needed that Twitter cannot provide.

Still, Rory Cellan-Jones of the BBC is holding out hope that Twitter can mature into a real-time news service:

Let’s see, as this story unfolds, whether this is the moment when Twitter comes of age as a platform which can bring faster coverage of a major news event than traditional media, while allowing participants and onlookers to share their experiences.

Unfortunately, I don’t think that will happen. Twitter is fast, and it will let you share your experiences, but it will never replace solid journalism and hard facts. What do you think?

So far, the answer is clearly no. Go vote yourself on Expelled: The Movement’s website.

I saw this physics interview question pop up on the internet, and thought it might be worth discussing:

A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction. This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in the opposite direction). Can the plane take off?

There are a number of forces here that apply: gravity, the force of the engines / airspeed / lift, and the drag of the wheels against the conveyor / the speed of conveyor. However, the wheels provide essentially a frictionless boundary between plane and ground; unlike car wheels, the wheels of an airplane spin freely in place. So, as the conveyor belt speeds up, the airplane stays in place, but its wheels spin at the same velocity. Furthermore, the lift of the airplane is relative to its airspeed, and its engines push against air. So, the airplane will accelerate forward and take off as normal.

The commenter “Max” has a nice summary as well: “A comparable example in my mind would be a car on a treadmill. If the car is being pulled along by a winch and the wheels are turning freely then the car is going to be pulled at an identical rate whether or not the treadmill is there or not (assuming as you did that the treadmill’s speed is inverse to that of the car).”