It’s a “On Hover Pin It” button from Pinterest. Pinterest saw a need and created the button after noticing companies using custom Pinterest buttons. This new button is the same as those, but is only visible when you hover over the picture.
The best part about this is it takes only one line of code to enter it on your existing website.
We came across this 2-minute video on YouTube that gives step-by-step instructions on how to add it to your Word Press site or blog photos.
Pinterest’s Developer site also has some great instructions too and can be found by clicking the following link.
While these sites DO have easy to follow instructions, we suggest going directly to Pinterest or a professional web developer just in case any of the codes or plug-ins you add don’t function properly.