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Today's Tech: Xbox 720 latest, Samsung Galaxy S4 aims for iPhone 5, and Twitter security woes

The recent spate of hacks on high-profile Twitter accounts has prompted calls from the social network and the wider security industry for organisations to bolster defences around their online profiles. Several accounts belonging to the Guardian were compromised at the beginning of the week, leading to a slew of tweets from hackers claiming to be part of the prolific Syrian Electronic Army. Similar attacks have already struck groups such as the Associated Press, the BBC, Burger King and Jeep this year, forcing Twitter to send security advice to organisations using the social network. Is your social media presence at risk? Read more and find out.

With impressive early sales of the Galaxy S4 pointing to yet more mobile dominance for Samsung, industry analysts have heralded the Korean firm's expertly-delivered marketing campaign as pivotal to its smartphone success. Though Apple's iPhone 5 and iPhone 4S currently take up the top two positions in the UK phone charts for April, the Samsung Galaxy S4 has seized third spot after just four days of being on sale, according to data from uSwitch. The S4 has pulled off an instant grab of the Android crown, leaving the richly-praised HTC One down in fourth place, while Samsung's Galaxy S3, Galaxy Note 2, Galaxy S3, and Galaxy S2 all feature in the top 10.

The Kobo Aura HD displaces the Kobo Glo as the top-end eBook reader in the current Kobo line-up, coming in at a whacking £40 over the Glo's £100 price tag - but is it worth the extra dosh? That's the question crack review artist Stuart Andrews sets out to answer in his Kobo Aura HD review. Billed by Kobo as "the only premium eReader on the market," the Aura HD is "designed for the discerning reader." The idea is to create a luxury model, the eBook reader equivalent of a Mercedes executive saloon or a Bang & Olufsen stereo - or, indeed, a Ferrari as Kobo first posited. Follow the link to find out more about the would-be king of the eBook reader world.

The concurrent release of the Xbox 720 and PlayStation 4 would provide a major boost to the gaming industry and benefit consumers, according to EEDAR analyst Jesse Divinch. Both of the next-generation consoles are being tipped with a late-2013 consumer release, which would see them arrive in time for the lucrative pre-holiday shopping season. In the first instance, the PS4 and Xbox 720 are expected to break cover at E3, a major annual gaming showcase held in Los Angeles in June - follow the link for more on how they could subsequently affect the UK's retail space.