Home - which will be available as a download from Google's Play Store - is viewed as a Facebook takeover of Android and a significant threat to Google, as it puts Facebook's updates, contacts, messaging service, photos and soon, more invasive advertising, directly on to your phone's lock screen and home screen.
As The Verge wrote: "Facebook just put the entirety of the core Android experience inside a blue-tinted, ad-sponsored wrapper, and then hid the wrapper as an app inside Google's own store."
Almost as soon as Home was announced some users worried that their calls, text messages, location and data from other apps would all be hoovered up. A lot of this data - including location, contacts and calls - Facebook already has access to if you use its existing Android app, while Facebook Messenger asks for permission to read your SMS and MMS.

Prominent tech blogger Om Malik wrote that Home "erodes any idea of privacy". "If you install this, then it is very likely that Facebook is going to be able to track your every move, and every little action," said Mailk.
Ovum telecommunications analyst Jan Dawson said more tracking and ads was "the biggest obstacle to success" for Home. "Users don't want more advertising or tracking, and Facebook wants to do more of both."