So if you have an image, that is not yours, you are passed it by a third party, are you allowed to use it (for company promotion and self promotion) if you simply add the flickr username to image?
It’s a bit like this…. I mentioned to a friend of a friend the other day in the pub that I was looking for a new bike, but funds were limited… the next day he knocks on my door with a brand new Orange Five, my size and everything and says I can have it as he found it, and it didn’t seem to belong to anyone…
Reread your post, think about the fact that photography is the product of someone’s hard work, determination, expenses, blood, sweat, tears, late nights, long days, frustrations and total joy… Then look at my scenario and make up your own mind…