I found a GIF of a guy skeet shooting listed on several sites and I've posted it in my Twitter account below:https://twitter.com/leeand00/status/488894537599680515I looked up the image on Google Images and it's listed several thousand times as having no license associated with it.  When I check the other license types it isn't listed there at all. Would I be posting this to my non-profits' account at our own risk?  Or does the fact that there is no license listed on Google make the image free game? 
Google lists this gif several thousand times as not having a license, is it safe to post on my company's Twitter account?
images;licenses