When Instagram originally came out, it was mainly designed to share photos that were taken with your phone, hence why you can't upload from a desktop and still can't as of today via Instagram. But there are 3rd party ways of doing it..like LR/Instagram plugin for Lightroom. As of today...the majority of photos I see on Instagram are from other cameras like DSLRs or Mirrorless cameras. At this point...Instagram might as well open it up to everyone and make it photo sharing site like Flickr, especially now that they will be introducing zoom function. However, the question remains...should you ONLY use Instagram to share the photos you've taken with your phone or does it really matter? I personally share a mixture of images on Instagram from all different kind of cameras and I don't think anyone honestly cares what camera I used. People on Instagram just want to see photos and doesn't matter if it was taken with a toaster or the hubble telescope, my opinion of course. But I'd like to hear your thoughts.