To share a job on social media click on a job you would like to share.
You will find the share symbol right next to the job title.
There is a slider button called Activate social media button. Once clicked the different social media buttons will appear where you can share your job. If you click on the corresponding logo a window which will lead you to the appropriate site.
Besides sharing on social media you can also forward a job via email or simply copy the job link.