Twitter's Jack of all trades

Jack Dorsey Image copyright Getty Images

It has been an open secret for days, but now it's official - Jack Dorsey is back as chief executive of Twitter.

The man who helped found the company, then was sacked amid all sorts of internal feuding, has now been confirmed as boss after serving as interim CEO since July.

But what was really remarkable about Monday's announcement was the news that Dorsey would stay on as Chief Executive of Square, the payments service he started after first leaving Twitter.

So now one man will be running two major enterprises which are both facing challenging times.

You only have to look at Twitter's share price to see what a task he has got on his hands there.

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Electricity from the air - Drayson's big idea

Clean space app

Free energy from the air. It sounds like a fantasy but that is what the entrepreneur and former science minister Lord Drayson has just unveiled at London's Royal Institution.

He claims that a technology called Freevolt can be the power source for the "internet of things", allowing low energy devices from wearables to sensors to operate without being plugged in.

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Google's gadget game

Google's launch Image copyright Getty Images

"Been awhile since I was this excited about a Google event," tweeted one tech blogger 30 minutes before the Nexus launch started. Maybe I am getting old and jaded, but it has been a while since I got really excited about any tech event, and this one was no exception.

Which is not to say that the five devices unveiled by Google were disappointing. In fact, the two phones, two streaming devices and the tablet shown off in an hour-long presentation all looked pretty clever additions to Google's hardware range. None, however, was particularly innovative and I'm still struggling to work out exactly what a firm whose wealth is built on software is doing making gadgets.

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Silicon Valley - still the capital of tech

Aerial view of Silicon Valley Image copyright Getty Images

What makes Silicon Valley tick? And can it go on ticking up profits as other centres of innovation snap at its heels?

That's what I've been pondering over recent days on a short trip here. What I've found is that this place is still far ahead of its rivals but finding real innovation here is becoming more of a struggle.

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Robots that sell you robots

I'm in Palo Alto, California, where we came across a shop with a salesperson outside trying to persuade people to come in.

There's nothing unusual in that - except the salesman was on a device called Beam, a sort of virtual presence.

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Will Amazon's new launch keep us taking the tablets?

Amazon has lobbed a bomb into the cut-price tablet market, with a new device costing under £50.

The news comes just a week after Apple unveiled its very expensive iPad Pro, a tablet aimed at persuading professionals to give up their laptops. Two very different strategies in a market in need of a shot in the arm.

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Facebook dislikes: Thumbs up or down?

Thumbs up and down Image copyright Thinkstock

Why has Facebook finally succumbed to the pressure to create a dislike - or rather "empathy" - button?

Yes, there is a need to allow people a more subtle response to your status update about your dog dying than a Like. But why can't people, as my wife asked me over breakfast, simply put a sad face up :-( 😞? And there's an obvious risk that whatever button is created will be used by trolls to punish anyone who says something they don't like.

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My day with a robot

I spent a day this week showing my new friend Harry Nao around my office.

He met lots of people - from John Humphrys on the Today Programme to Radio 2's Jeremy Vine - and many who came into contact with him were charmed. But here's a confession - I was rather disappointed in his conversation and his overall level of intelligence.

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AI is not new, so why suddenly does it matter?

Employee checks supercomputers at a research institute Image copyright Getty Images

Here come the Intelligent Machines.

This week on the BBC you may get the impression that the robots have taken over. Every day, under the banner Intelligent Machines, we will bring you stories on online, TV, radio about advances in artificial intelligence and robotics and what they could mean for us all.

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Apple and Microsoft - peace at last

Tim Cook in front of a display showing the iPad Pro at 9 September launch Image copyright Getty Images

Microsoft versus Apple, a rivalry dating back more than three decades, pitching two different visions of what is important in technology against each other.

Fans of each company are particularly bitter in their disdain for the other camp - as either philistines who fail to see that the design of a product is key to its value, or hipster sheep who will pay over the odds for any iDevice.

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