By , (Reuters) - Messaging app Signal has seen “unprecedented” growth following a controversial change in rival WhatsApp’s privacy terms and is looking to hire more staff as it seeks to bolster the service and supporting infrastructure, the head of its controlling foundation said on Wednesday.Slideshow Along with another encrypted app, Telegram, Signal has been the main beneficiary of online outrage around the changes announced last week, which require WhatsApp users to share their data with both Facebook FB.O and Instagram.Telegram said on Wednesday it had surpassed 500 million active...…By , (Reuters) - Messaging app Signal has seen “unprecedented” growth following a controversial change in rival WhatsApp’s privacy terms and is looking to hire more staff as it seeks to bolster the service and supporting infrastructure, the head of its controlling foundation said on Wednesday.Slideshow Along with another encrypted app, Telegram, Signal has been the main beneficiary of online outrage around the changes announced last week, which require WhatsApp users to share their data with both Facebook FB.O and Instagram.Telegram said on Wednesday it had surpassed 500 million active...WW…