The effects of compression aren’t really noticable in the Newsfeed area where images are small, but once a photo is expanded, the low-quality compression becomes obvious.
With a recent server-side switch, Facebook has added an option for uploading photos in HD from Android, which matches their efforts on the Web and iOS. No app update is required to get the new option, but you’ll need to wait until Facebook makes it available on your account.
To check if you can upload photos in HD, head to the Facebook app menu (three lines) > App Settings. There will be a new toggle titled “Upload HD photos.”
For Facebook, uploading in HD still doesn’t mean original quality, but it does allow images to be a maximum of 2048 pixels wide. If you’re not connected to WiFi when uploading, it’s also worth noting that you’ll use more data to upload these larger photos to Facebook.
Source [ Cnet ]