Amex teams with Twitter for 'tweet to buy' service

American Express has extended its deal with Twitter to allow users to link their cards to their Twitter account and buy products directly from within Twitter.

Twitter denies suppressing #wikileaks

With companies falling over themselves to distance themselves from Wikileaks, there's been a lot of talk in the blogosphere over the last 24 hours about why Wikileaks has been failing to trend on Twitter - after all, it's probably one of the most widespread subjects of discussion on Earth right now.