Deadly copyright trap?

You better not overuse them and try to attribute the images to their authors whenever you can. However, these days it's much harder to track the images across the web and if you don't have millions of monthly visitors, they might not even pay attention to you.

However, my suggestion will be to use Creative Commons images or best, produce your own. These days, even if you don't have a professional camera it's quite easy to do. And there are tons of free tools and websites to create visuals for your own usage, though it takes more time.

This article from Buffer is really helpful to identify free image resources: blog.bufferapp.com/free-image-sources-list?utm_campaign=weekly_digest
I especially love IM photos, Death to the stock photo and Gratisography, Picjumbo and Unsplash, though some images from their libraries are getting overused already.

I recommend using free stock photo websites or using the usage tools in Google.

Thanks for the contributions people from WF. jp
Search around here there are several options including pay.
Lately I have been putting "compliments of yummly" only because he's not right with a TM.

If I were you, I will be worried.
Pictures from blogs, pins or facebook may be copyrighted.