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What it's like to order restaurant food with Deliveroo's app

London startup Deliveroo is now in 30 UK cities and 20 others around the world but how does it work? 

The platform, now backed with over $200 million (£133 million), allows consumers to get restaurant food delivered to their home or office — even when that restaurant doesn't necessarily offer deliveries.

This means Londoners, for example, can get Honest Burgers delivered straight to their sofa without having to walk out of their front door. 

A 5th person has been arrested over the hack of TalkTalk on 'suspicion of blackmail'

A fifth person has been arrested as part of the police investigation into the hack of TalkTalk, the Metropolitan Police announced early on Monday morning.

An 18-year-old boy was arrested in Llanelli, Wales, on suspicion of blackmail.

After the company was hacked in October, it said it was targeted by a ransom demand, although TalkTalk wasn't sure it the demand was authentic. It is not clear whether this is the blackmail that the teenager is suspected of.

There are been four previous arrests during the investigation:

A 15-year-old boy from County Antrim, Northern Ireland. A 16-year-old boy from West London. A 20-year-old man in Staffordshire. A 16-year-0ld boy in Norwich. 

10 things in tech you need to know today (AAPL, HP, AMZN)

Good morning! Here's the tech news you need to know this Wednesday.

1. Slack, the $2.8 billion (£1.85 billion) work chat and collaboration startup, is getting ready for an IPO. Stewart Butterfield, Slack's founder and CEO, said in an interview with The Australian Business Review that the company recently kicked off an "IPO readiness" program.


$2.8 billion startup Slack is getting ready for an IPO

Slack, the popular workplace messaging app, is preparing for an IPO. 

Stewart Butterfield, Slack's founder and CEO, said in an interview with The Australian Business Review that the company recently kicked off an "IPO readiness" program. The idea, Butterfield said, is for Slack to have the option to go public in the future and to be prepared when the time is right.

"We’ve done our first external audit and we’ve put in place a lot of controls and security practices. There’s a lot of predictability that needs to be evident in the business, so we’re spending a lot on analysis and data infrastructure," he said in the interview. 

Meg Whitman: Dell's $67 billion acquisition of EMC is the exact opposite of what HPE is doing (HPE)

When Dell announced its planned $67 billion acquisition of storage giant EMC, one person couldn't wait to come out as a naysayer: Hewlett Packard Enterprises CEO Meg Whitman.

She immediately sent an email to her troops pointing out what she described as the downsides of the merger and claimed that her new company, HPE, was "two years ahead of the game and it will be difficult for others to catch up."

It's hard to see HPE as ahead of the game when it's been in the middle of a years-long painful restructuring, splitting itself in two, with shrinking revenues and massive layoffs.

So on Tuesday, after HP reported its

Why developers and marketers are bullish on the mobile-app ad

Mobile marketers have struggled to find an ad unit that leads to conversions, not just fat-finger clicks.

But the mobile app-install ad — an ad that directs users to download a mobile app — finally offers measurable and impressive ROI. Facebook was the first major pioneer of this ad, and since its debut, Yahoo, Twitter, and Google have all launched their own version of this ad unit.

The ads are popular among developers who need their apps to stand out among the millions of mobile apps on the Google Play and the Apple app stores. And, for major mobile platforms, these ads command high prices that make them very attractive inventory. 

Mark Zuckerberg is taking 2 months off to be with his newborn — here's why Facebook employees say his decision is so important

Long before it was trendy, Facebook cultivated a company culture where it's taboo for dads not to take parental leave, and CEO Mark Zuckerberg's recent announcement cements Facebook's status as a compelling case study for how to make parental leave policies work.

While it's unclear how much time he plans to take during the year following his child's birth — many dads at Facebook split their time rather than take the available four months at once — last week Zuckerberg

The buzzy startup trying to kill Amazon just raised another $350 million — with more to come

Jet, the flashy e-commerce startup trying to take on Amazon, just raised $350 million in fresh funding at a $1 billion valuation, Re/code's Jason Del Rey reports.

The company has now raised a whopping $570 million since its founding last year, and CEO Marc Lore tells Del Rey that it already has "verbal agreements" for another $150 million, coming soon. 

The news comes not long after The Wall Street Journal reported that Jet desperately needed more funding, because it was rapidly burning through money (with only $63 million left in the bank in October).

Meg Whitman: We just signed a big deal to help Microsoft sell its Amazon-killer cloud (HPE)

We now know how Hewlett Packard Enterprise plans to keep itself in the cloud computing game now that it decided to shutter its public cloud computing business and not compete head on with Amazon, Microsoft, Google and IBM.

HPE is going to partner with Microsoft to sell Microsoft's cloud, Azure, HPE CEO Meg Whitman told analysts on the quarterly conference call on Tuesday.

She said that HP "reached an agreement with Microsoft" in which HP will sell Microsoft Azure as its "preferred cloud alternative." In exchange, HP will become a "preferred" cloud services provider when Microsoft customers are looking for consulting or other help, she said.

More details about the deal will soon be announced, she noted.

ISIS has figured out ways to get around restrictions on one of the main apps it uses for propaganda

It appears that the terrorist group ISIS has figured out how to get around some roadblocks on one of the main applications it uses to disseminate propaganda.

Last week, Telegram shut down 78 ISIS-related channels after terror attacks rocked Paris and opened up questions about how terrorists use encryption to prevent their communications from being intercepted.

ISIS (also known as the Islamic State) has been using the messaging app as a means of communicating and distributing its propaganda material since September, when Telegram