There are lots of factors involved in taking the perfect photo, most of which are ignored when someone is simply reaching out an arm (or stick) to snap a selfie.
But that doesn't mean you should throw all photo prep out the window, because reflections in the background might end up revealing more about your selfie shoot than most people care to see.
So save yourself from embarrassment and humiliation and make sure those mirrors and windows aren't revealing more than you'd like to let on about what you were doing when the pic was taken.
Of course, if a reflection enhances the photo then by all means shoot and share, so your friends and followers can admire all of your hard work!
See These Embarrassing Reflection Fails That Will Remind You To Pay More Attention here. Some images are NSFW.
(Though I was completely dressed and not doing anything embarrassing.)