Some folk seriously think they're being community-minded when they comment on as many images as they can.  Others, as BAR-CODE has stated, just aren't English speakers, so they pre-write a comment, and copy/paste it on the ones they like.  Others are looking to GET about 1/2 the comments they give.   

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.