Apple, Facebook, Twitter — all hacked. And there’s probably more to come. In the spate of large companies hacked in recent weeks, it seems that many of them have one thing in common. Many of them have visited one compromised web site specifically devoted to sharing information related to mobile development. It’s a hub for many companies concentrated on the mobile space, and it’s not just tech companies. The site is called iPhonedevSdk, according to sources close to the Facebook hacking investigation. After Facebook employees visited the mobile development site in recent weeks, malicious code injected into the HTML of the site used an exploit in Oracle’s Java plugin to infect employee laptops, as the company divulged last Friday. When asked for comment on the site in question, Facebook referred us back to the company’s blog post from last week, without going into further detail.