You can give others access to your Drive files using their email or a public link.
: You can set people as a Viewer , Commenter , or Editor . Post to Social Media 32 - Google Drive
: Download the file to your computer first, then upload it directly to the social media site. Managing Your Posts/Uploads You can give others access to your Drive
: If you try to email a file over 25MB via Gmail, it will automatically "post" it as a Drive link instead of an attachment. 32 - Google Drive
: Anything you upload is private by default unless you explicitly change the sharing settings to "Anyone with the link".