Thanks, flickr creative commons is a good resource for images that people can use in their posts legally so long as they follow the license (usually needs to be attributed to them with a link to the original in the image caption or at least somewhere in the article). Quoting a sentence or three isn't necessarily a problem so long as you cite your sources, but anything beyond that is really pushing the boundaries of IP theft and fair use. And on Steemit it is pretty easy to see how much someone made off of your work if they just copy pasted, so it's not going to be that difficult to decide if it's worth talking to a lawyer and pursuing it... ;-).