Listening to a LensWork podcast by Brooks Jensen recently, he mentioned the idea of aspect of photos and how the "standard" image has shifted over the years as we get more and more used to the wider HDTV and computer monitors that we look at daily.
Most computer monitors and HDTV are at an aspect of 16:9 or 16:10 versus the more traditional 4:3 or 4:5.
I've noticed for a long time, that when I'm processing my train photographs, I tend to think in wider images. I've used a lot of 15:5 (aka 3:1 or simulated panorama) in order to present these type of shots.
However they do not always present well in social media streams as they either get displayed very small or are cropped to show the center of the image.
The same thing has recently been happening with my 1:1 #photosquared shots, especially when coming across in the new "larger preview" links on G+ and FB. The programs are cropping it into a 16:9 and never where I'd want it done.
The new challenge for me is going to be to "think 16:9" when I'm composing shots much I like currently look for shots which I know I'll crop to 1:1 later in post-processing. I'm also going to look for some older images where I can process and share a 16:9 format at least in social media formats. A benefit is they also look great on my screen at work as a desktop.
If you have never listened to the LensWork podcast (or read the great Black & White Art Photography magazine) check it out at http://daily.lenswork.com