Unsecured database containing 17 million email addresses was found to be part of fraud targeting Groupon, Ticketmaster and other online ticket vendors
Attacks since November still ongoing, complain Groupon users
Discount voucher firm wants to better manage millions of queries a day
Customers' personal data gathered but credit card data hasn't been accessed
Andrew Mason fired following a string of poor financial results
Recent IPOs reveal a marked preference among investors for B2B software firms
It's been a good week for hardware, but a grim few days for social media