There are always issues on the subject of publishing images and copyright. Not only will every creator respond differently when finding out that their images have been used and shared by others, but there is off course also a legal provision in force. And the legal provisions nowadays mostly are not enough up-to-date to accurately respond to the latest technological developments. Also, the publication of your work on social media affects your legal ownership of the image. But what is the sensible thing to do as a creative, when it comes to publishing your work online?
As long as you publish your work on your own website that has it's own url (domain name), you can rightfully prove your ownership over the images. But how will people know that an image they find randomly on the internet, was originally published on your website?
Many artists publish their work on social media such as Facebook, Twitter, DeviantArt, and so on. This is a great idea when it comes to building an audience, but many social media also become owners of the concent you publish on them. Facebook for instance has the permission to share (and to let your images be re-shared) when you upload images. And all social media go about copyrights their own way.
It is therefore always wise to not upload all your content and images unto social media. Just upload fragments (when you've made a series of photopraphs for instance, only upload nummer 3 out of 6 photo's). By doing this, you can prove that you are the original owner and creator of the image (you've got the rest of the serie to prove that). Also always include your name and company name in the title of the image and as a watermark that is hard to remove, but that doesn't ruin your image.
Also always register your company name and to include the company name in the title of the image, so you can make a stand when it comes to international legal provisions. The law differs from country to country, but to internet doesn't know the limits of country borders when it comes to sharing online.