Photos receive 53 Percent more likes on Facebook than the average posts and 84 percent more link clicks. Some of you might be asking, What are the “rules” for posting pictures on Facebook? Obviously not patient photos, but those similar to the pictures found on a Google Search or on Pinterest.
So if you know that you don't want to violate any copyright laws, and you're just not sure how to play fair.
Here's a little known Google Secret!!
If you want to use images which appear in your Google image search, you can find images which are labeled for reuse. Here's How: Google>Images>Search Tools> Labeled for Reuse.
In addition to paid sites, there are also lots of free sites available!