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I had missed that facebook owned instagram.

And each has slightly different look and feel. Facebook and their products…

The FB and Messenger ones are different too!? At least the other three are separate accounts, so that's justifiable, but FB and Messenger are the same account, they're even the same website on desktop.

>they're even the same website on desktop

This isn't entirely correct - there is messenger.com if you want to use messenger without the distraction of your news feed.

Wow, strange that I use FB every day and have never head of that.