Are you posting photos on your website or your blog? You must have permission from the photographer or owner of the photo to publish someone else’s photos. Many people are glad to give you permission, but you need to ask them. Using someone’s photo without permission is illegal and may subject you to claims of infringement. There are many sites which offer free photos or inexpensive licensing of photos. While we are ready and willing to defend you on infringement claims, you are better served to do it right the first time.