Macgasm brings us word that Twitter has expanded the in-page previews on its website to include iOS App Store app details. Although originally designed to do inline previews of made-for-Twitter image services like yfrog and TwitPic, Twitter has been expanding the concept in recent months; it now includes Flickr images, YouTube videos and images from the insanely popular Instagram service.
The preview for the App Store is quite detailed; as you can see, it includes the app icon, description and screenshot. If you haven't
