An 'Upvote' is a way for people in your company and others to show their support for the Job Post you have published, and help your post reach more people.
People who click on 'Upvote' have the option to share job postings on their connected social media accounts. The more 'Upvote' is clicked, the better chance the Job Post has to be displayed on the Wantedly top page!
In order to share on Facebook, make sure your Wantedly account is connected with your Facebook account.