Google displays thumbnails for documents, spreadsheets, drawings and music files, a player for presentations and videos and the description for archives. It's important to change the visibility options to "anyone with the link" or "public on the web".
You can also paste a Google Drive URL in a Google+ post and you'll the same thumbnails and players.
Google still doesn't do a good job at integrating Google Drive with other Google services. For example, you can't pick a Google Drive file (other than photos) when writing a Google+ post. You can't select a Google Drive file when composing a Gmail message and you can't upload files to Google Drive instead of sending them as attachments.
Microsoft's Hotmail (now called Outlook) has a clever feature that uploads large attachments and Office documents to SkyDrive, so it only sends the links.
{ Thanks, Herin. }