If there is a link in your email message (GMail), linking to a
or Yelp, a preview of the video, photo or photo album will appear in the GMail message itself.
This makes easy for us to view the album, watch the video, browse the photos, etc, directly in the email message.
How to enable in my GMail account?
1. Go to Labs in gmail.
2. Enable “Picasa previews”, “Flickr previews”, “Youtube previews” and “Yelp previews”.
(whatever you want to enable)
3. Save changes