There are many products that have hundreds of millions of active users in a single month, but there are few that have passed the billion mark. However, the select group, which includes the likes of YouTube and Facebook, has just gotten bigger.

And it is Google and Facebook which once again add new members to that list, with Gmail and WhatsApp, respectively, joining the pack. Both services passed that milestone in January, with one taking longer than the other to reach it.

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Moves by governments to monitor web-based communication with a view to thwarting terrorism is utterly, utterly futile. Just like the NSA's dragnet-style dredging for intelligence, mass communication surveillance does little to home in on target -- the ones that government should be concerned about are the very ones who know who to evade detection.

This is something that was perfectly demonstrated this week when it became apparent that ISIS has developed its own secure messaging system. No longer reliant on the likes of WhatsApp, ISIS is using a custom-built, Android-based encrypted messaging tool that is incredibly difficult -- if not impossible -- for the FBI and NSA to monitor.

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A new malware campaign is aiming specifically at businesses and consumers using the WhatsApp mobile messaging service.

Uncovered by researchers at Comodo Labs the campaign uses emails masquerading as WhatsApp content. These have an attached zip file containing a malware executable.

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As most people nowadays rely on smartphone applications to do tasks or to be entertained, security firm AVG Technologies has recently released its updated list of the most battery-draining, as well as the data and storage consuming applications there are today.

According to over a million anonymous devices gathered worldwide, AVG’s report showed that messaging apps Kakao Talk and WhatsApp, as well as social networking apps Facebook and Instagram, remain to be the top apps that drain a device’s battery and use up the users’ storage and data.

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A security researcher at Check Point has discovered a vulnerability in the WhatsApp Web app. The app -- which allows for WhatsApp messages sent to a phone to be viewed on a desktop computer, as well as syncing data -- can be exploited if a malicious user sends a specially-crafted vCard contact to someone.

A problem with WhatsApp's filtering of the contact card means that it could be used to "trick victims into executing arbitrary code on their machines in a new and sophisticated way". What's particularly worrying about this vulnerability is the fact that all an attacker needs is the phone number associated with a WhatsApp account. With an estimated 200 million WhatsApp Web users, there are a lot of potential victims.

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WhatsApp introduced a web interface for its messaging service early this year, giving Android, BlackBerry and Windows Phone users the option to chat with their contacts straight from a browser -- that is, as long as that browser is Google Chrome. Those toting iPhones, however, have been left out.

The reason why WhatsApp Web has not supported iPhones from the start is, according to an official blog post that did not go into specifics, "Apple platform limitations". Luckily, WhatsApp has figured out a way around them, opening its web interface to iPhones.

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WhatsApp officially introduced voice calling in mid-March, after a couple of months of private testing. The feature, which was announced a year before, arrived on Android first, making its way to iOS less than a month after. Windows Phone users, however, were left waiting.

But, thanks to the latest update to the Windows Phone app, WhatsApp Calling is now also available for those using the tiled smartphone operating system.

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Facebook said it might allow businesses to contact users through their chat app WhatsApp, Bloomberg said in a report on Tuesday.

This might be the first hint on how the social media giant plans on making money off the app that it bought for $22 billion (£14 billion).

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WhatsApp, the popular instant messaging client, has reached 800 million monthly active users, company’s CEO Jan Koum shared the stat on his Facebook account last night. Interestingly enough, the company has just rolled out an update to its Android client to include an online conversation backup option. Users now have the option to take a backup of their conversation to Google Drive.

The updated version of WhatsApp’s Android client -- v2.12.45 -- is available to download through company’s official website. At the time of writing, this option wasn’t available to WhatsApp’s iPhone and Windows Phone clients, as well as not live on Google’s Play Store.

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The writing has been on the wall for quite some time now, but the deadline is finally here. Google's Gtalk service is set to be discontinued as of 16 February, and from this time users will have to use Google Hangouts or seek out an alternative.

This is not the first online service that Google has killed, and it certainly won't be the last. While Hangouts is generally regarded as a superior service, there are still diehards who will hold out until the very last minute to switch -- or they might jump ship completely in favor of something like WhatsApp.

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WhatsApp today rolled out an update to its iOS app, which along with bug fixes adds a dialer button to its text messaging service. The dialer button -- as you might imagine -- is for placing voice calls, a feature that the Facebook-owned company announced last February. Earlier this week, the same feature was spotted on the WhatsApp’s Android client, and the company also confirmed that it was beta testing it with select users.

The feature, however, doesn’t work just yet, but changes in the user interface do give us an idea of what this forthcoming feature will look like. It is evident that WhatsApp has plans to roll out the voice-calling feature to its app shortly. But why is everyone in the press writing about it? How does the addition of voice calling functionality -- something which Facebook’s Messenger, Google’s Hangouts, and Microsoft’s Skype already offer -- change things? Here’s how.

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A new update has been rolled out to WhatsApp that lets users see when the person they are talking to reads a message. The check marks that appear next to messages to indicate that a message has been successfully sent and successfully delivered now have a third indicator mode. A double blue check mark means that the message has been read.

WhatsApp took the messaging world by storm when it first appeared on the scene. Despite having been found to be one of the most insecure messaging tools out there, it remains incredibly popular with around 600 million monthly users. WhatsApp's impact was such that Facebook parted with $19 billion to buy it, and this month the service celebrates its fifth birthday.

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Secure communication is something we all crave online, particularly after Edward Snowden's NSA revelations increased public interest in privacy and security. With dozens of messaging tools to choose from, many claiming to be ultra-secure, it can be difficult to know which one to choose and which one to trust. Electronic Frontier Foundation (EFF) has published its Secure Messaging Scorecard which rates a number of apps and services according to the level of security they offer.

It's a fairly exhaustive list that includes numerous well-known names, as well as several more niche products. What is concerning, however, is that many of the most popular tools -- WhatsApp, Yahoo Messenger, Skype, SnapChat, and Facebook chat -- received very low ratings for failing to protect users and their communication data.

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