We've mentioned how useful Google's Search by Image function can be in verifying images before – like a regular image search in reverse, you put a picture in the search engine and get results based on where it has been used previously – but the tool is also available as a Chrome plug-in.

Once downloaded, just right click on an pic and select "search Google for this image" to get the results.

It won't tell you whether an image is fake or not but will show you where it has been used before and therefore help you find the source or deduce if it has been misappropriated.

Thanks to Paul Watson for flagging up the plug-in.

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