Tweets with "Media" inside

Question

I see some tweets have some kind of HTML embedded. How is it possible to do this?

Answer 1

It certainly is a list of hardcoded partnerships, as @dtt101 suggested.

Evidence: here's a list of partners as taken from their javascript source (the js file with "hogan-more" in it, e.g. at t1-hogan-more-en-201203071014.js ):

edit: updated with domain names from the source

• Amazon: www.amazon.com
• AolVideo: http://www.aol.com
• Apple: http://itunes.apple.com
• BlipTV: blip.tv
• CNN: http://cnn.com
• DailyBooth: dailybooth.com
• DeviantArt: http://deviantart.com
• Dipdive: http://dipdive.com
• Etsy: http://etsy.com
• Facebook: https://facebook.com or http://facebook.com
• Flickr: https://secure.flickr.com or http://www.flickr.com
• Foursquare: www.foursquare.com
• GoogleVideo: http://video.google.com
• Gowalla: www.gowalla.com
• Hulu: http://www.hulu.com
• Instagram: instagr.am
• JustinTV: http://justin.tv
• Kickstarter: kickstarter.com
• Kiva: http://www.kiva.org
• Livestream: http://www.livestream.com
• Lockerz: www.lockerz.com
• Meetup: www.meetup.com
• MSNBC: http://msnbc.com
• MTV: http://mtv.com
• NHL: http://www.nhl.com
• Photobucket: http://photobucket.com
• Photozou: http://photozou.jp
• Plancast: plancast.com
• Rdio: rdio.com
• SlideShare: http://slideshare.com
• Twitgoo: http://twitgoo.com
• TwitPic: twitpic.com
• Twitter: twitter.com
  • CopiedTwimg: twitter.com
  • Twimg: twitter.com
• TwitVid: www.twitvid.com
• Ustream: http://ustream.tv
• Vevo: http://vevo.com
• Vimeo: vimeo.com
• WallStreetJournal: http://online.wsj.com
• WashingtonPost: http://washingtonpost.com
• WhoSay: www.whosay.com
• With: https://with.me or http://with.me
• WordPress: wordpress.com
• YFrog: yfrog.com
• Youtube: www.youtube.com

Answer 2

https://dev.twitter.com/blog/photo-upload-api tells you how it works. There is an API which you can use to attach photos to tweets.