Site Rules mentions copyright
In the list of rules for this site it mentions breach of copyright.
So if I may be permitted I would like to point out this
What a lot of people don't realise this extends to photography as well. So my advise is to put a link to a photograph and not post the actual photograph itself.
If you are worried about someone "lifting" your photo for their own purposes there are a couple of things one can do and what not to do
Do not put you signature somewhere on the photo, it can be erased quicker than you can add it
Don't even rely on the picture data (exif) imbedded in the photo, that can be just as easily removed
Best practise
Either make the picture small with few pixels so when blown up it is out of focus and un useable
Or put a watermark across it,which is a lot harder to remove and most will not even bother. That way your picture is a bit safer on the internet.
The ultimate answer is if you consider your photograph has selling potential, never ever put it on the internet anyway.
If a potential client want to buy it send a "proof " copy as I mentioned for them to examine and the full photo upon payment.
Also just one other thing the photographer has the intellectual property rights , so if a client wants to reproduce for product placement they would have to pay to do this