Twitter fires first shots against Instagram/Facebook

The Great Network Wars of 2012 have begun.

Someday, your children will ask you "where were you when the first shots of the great Twitter Wars were fired?" Well, if you're reading this from Britain, you were probably in bed, but fired they were last night, as Twitter disabled access to parts of its network for the Facebook-owned photo sharing app Instagram.

TechCrunch's Alexia Tsotsis reports:

Instagram has just announced 80 million users and a new app update; Noticeably missing in the update? The “Find Your Friends” on Twitter feature, which allowed users to follow the same people they follow on Twitter on Instagram.

The “Tweet Photo” feature is still available.

We’ve learned that the feature is missing due to API restrictions from Twitter’s end. . .

The official word from Twitter, as told to The Next Web's Brad McCarthy:

We understand that there’s great value associated with Twitter’s follow graph data, and we can confirm that it is no longer available within Instagram.

Twitter is, it appears, deathly serious about consolidating its users into one big, official-client using, advertising-watching mass of people. It announced earlier this month that it was going to be severely restricting API access – the method by which apps communicate with the network – to unofficial apps like Hootsuite, Tweetbot and Ubersocial "replicate the experience of using Twitter.com".

Now it apparently wants to protect its "follow graph", the information about who follows who, as well. What's interesting is that this is not a blanket change to the API. Smaller apps, like the reading service Instapaper, still have access to the follow graph, and are using it in the same way Instagram has been banned. This is a surgical strike against Facebook.

Twitter is playing a dangerous game with their users here, however. Part of the reason the service is so popular has been the ease with which other ones can hook into it. Yes, Instagram needed access to the follow graph to take off; but once all your Twitter friends became Instagram friends as well, the bond of the first app grew stronger. If everything comes from one site, there is the chance that the walled garden that they are trying to create may keep people out as well as in.

The conflict – between how they grew and how they want to grow – was summed up well by Matt Yglesias, who wrote that Twitter wants to be an advertising company, but all its users want it to be a service provider:

Rather than selling lots of ads on Twitter, Twitter could sell itself as a service to the large number of people and firms who are already organically using it as an advertising tool.

Which is just to say that the Twitter user base seems ideal for a tiered pricing model. Most people on Twitter don't tweet that much, don't have very many followers, and don't particularly aspire to having a large number of followers. Then you have a relatively small minority of heavy users who are deliberately courting a mass Twitter audience. Just charge us! Let everyone with fewer than 500 followers use it for free, and then have a few tiers of pricing for people with large followings. Most people probably have no desire to pay for Twitter, but anyone who's bothered to amass 20,000 is obviously getting a lot of value from access to the Twitter audience and would pay for it. Meanwhile the broad mass of non-professional users could keep using a great no-charge ad-free service that creates the ecosystem pro users want to pay to gain access to.

Sadly, the company is unlikely to take that advice; yet for many people, a small monthly fee would be worth it to keep twitter the way it was when they joined it. Just remember, if you aren't paying for something, you aren't the customer – you're the product being sold.

Douchebag Twitter.

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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Inside Big Ben: why the world’s most famous clock will soon lose its bong

Every now and then, even the most famous of clocks need a bit of care.

London is soon going to lose one of its most familiar sounds when the world-famous Big Ben falls silent for repairs. The “bonging” chimes that have marked the passing of time for Londoners since 1859 will fall silent for months beginning in 2017 as part of a three-year £29m conservation project.

Of course, “Big Ben” is the nickname of the Great Bell and the bell itself is not in bad shape – even though it does have a huge crack in it.

The bell weighs nearly 14 tonnes and it cracked in 1859 when it was first bonged with a hammer that was way too heavy.

The crack was never repaired. Instead the bell was rotated one eighth of a turn and a lighter (200kg) hammer was installed. The cracked bell has a characteristic sound which we have all grown to love.

Big Ben strikes. UK Parliament.

Instead, it is the Elizabeth Tower (1859) and the clock mechanism (1854), designed by Denison and Airy, that need attention.

Any building or machine needs regular maintenance – we paint our doors and windows when they need it and we repair or replace our cars quite routinely. It is convenient to choose a day when we’re out of the house to paint the doors, or when we don’t need the car to repair the brakes. But a clock just doesn’t stop – especially not a clock as iconic as the Great Clock at the Palace of Westminster.

Repairs to the tower are long overdue. There is corrosion damage to the cast iron roof and to the belfry structure which keeps the bells in place. There is water damage to the masonry and condensation problems will be addressed, too. There are plumbing and electrical works to be done for a lift to be installed in one of the ventilation shafts, toilet facilities and the fitting of low-energy lighting.

Marvel of engineering

The clock mechanism itself is remarkable. In its 162-year history it has only had one major breakdown. In 1976 the speed regulator for the chimes broke and the mechanism sped up to destruction. The resulting damage took months to repair.

The weights that drive the clock are, like the bells and hammers, unimaginably huge. The “drive train” that keeps the pendulum swinging and that turns the hands is driven by a weight of about 100kg. Two other weights that ring the bells are each over a tonne. If any of these weights falls out of control (as in the 1976 incident), they could do a lot of damage.

The pendulum suspension spring is especially critical because it holds up the huge pendulum bob which weighs 321kg. The swinging pendulum releases the “escapement” every two seconds which then turns the hands on the clock’s four faces. If you look very closely, you will see that the minute hand doesn’t move smoothly but it sits still most of the time, only moving on each tick by 1.5cm.

The pendulum swings back and forth 21,600 times a day. That’s nearly 8m times a year, bending the pendulum spring. Like any metal, it has the potential to suffer from fatigue. The pendulum needs to be lifted out of the clock so that the spring can be closely inspected.

The clock derives its remarkable accuracy in part from the temperature compensation which is built into the construction of the pendulum. This was yet another of John Harrison’s genius ideas (you probably know him from longitude fame). He came up with the solution of using metals of differing temperature expansion coefficient so that the pendulum doesn’t change in length as the temperature changes with the seasons.

In the Westminster clock, the pendulum shaft is made of concentric tubes of steel and zinc. A similar construction is described for the clock in Trinity College Cambridge and near perfect temperature compensation can be achieved. But zinc is a ductile metal and the tube deforms with time under the heavy load of the 321kg pendulum bob. This “creeping” will cause the temperature compensation to jam up and become less effective.

So stopping the clock will also be a good opportunity to dismantle the pendulum completely and to check that the zinc tube is sliding freely. This in itself is a few days' work.

What makes it tick

But the truly clever bit of this clock is the escapement. All clocks have one - it’s what makes the clock tick, quite literally. Denison developed his new gravity escapement especially for the Westminster clock. It decouples the driving force of the falling weight from the periodic force that maintains the motion of the pendulum. To this day, the best tower clocks in England use the gravity escapement leading to remarkable accuracy – better even than that of your quartz crystal wrist watch.

In Denison’s gravity escapement, the “tick” is the impact of the “legs” of the escapement colliding with hardened steel seats. Each collision causes microscopic damage which, accumulated over millions of collisions per year, causes wear and tear affecting the accuracy of the clock. It is impossible to inspect the escapement without stopping the clock. Part of the maintenance proposed during this stoppage is a thorough overhaul of the escapement and the other workings of the clock.

The Westminster clock is a remarkable icon for London and for England. For more than 150 years it has reminded us of each hour, tirelessly. That’s what I love about clocks – they seem to carry on without a fuss. But every now and then even the most famous of clocks need a bit of care. After this period of pampering, “Big Ben” ought to be set for another 100 or so years of trouble-free running.

The Conversation

Hugh Hunt is a Reader in Engineering Dynamics and Vibration at the University of Cambridge.

This article was originally published on The Conversation. Read the original article.