I have been a long time flickr user. The features I like is the ability to post exif info, access to all aspect ratios and resolution up to 2048 which is fine to avoid people downloading your images
Flickr as many other sites is in trouble and now everyone seems to share on instragram.
I struggle with Instragram the maximum resolution dimensions is 1350 pixels and it only really support 5:4 and 1:1 aspect ratios
Besides it seems very hit and run on mobile platform with small screens not really a great medium to share your work but maybe I am limited and I do not see great potential
Would like to hear from @adamhanlon or @Alex_Mustard how they deal with this platform