Dribble is an interesting social media and graphic design upload service that allows you to showcase your work to other graphic designers. You can do things such as liking other artists' works or adding them to a bucket list of interesting images. It is also a nice tool to showcase some of the things you've been working on. It supports bitmap or raster image uploads and animations (which I assume to be GIFs).
Here is a link to my profile as the founder of this site.