In reply to keith-ratcliffe:
Not all photos posted are intended to be perfect or even necessarily good. Many might be mere snaps or posted for some other reason. On here I sometimes post a pic because it might be the only shot of a particular route (or simply better that what's up already).
Text is different because it's usually an opinion about something and it's posted with the intention of sparking discussion.
Words are used for debate, images are mostly used to illustrate something.