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

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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
www.amazon.comhttp://www.aol.comhttp://itunes.apple.comblip.tvhttp://cnn.comdailybooth.comhttp://deviantart.comhttp://dipdive.comhttp://etsy.comhttps://facebook.comorhttp://facebook.comhttps://secure.flickr.comorhttp://www.flickr.comwww.foursquare.comhttp://video.google.comwww.gowalla.comhttp://www.hulu.cominstagr.amhttp://justin.tvkickstarter.comhttp://www.kiva.orghttp://www.livestream.comwww.lockerz.comwww.meetup.comhttp://msnbc.comhttp://mtv.comhttp://www.nhl.comhttp://photobucket.comhttp://photozou.jpplancast.comrdio.comhttp://slideshare.comhttp://twitgoo.comtwitpic.comtwitter.comtwitter.comtwitter.comwww.twitvid.comhttp://ustream.tvhttp://vevo.comvimeo.comhttp://online.wsj.comhttp://washingtonpost.comwww.whosay.comhttps://with.meorhttp://with.mewordpress.comyfrog.comwww.youtube.com