TechCrunch revealed that Facebook will be adding a feature this week that will allow you to send your Facebook status update out as a tweet. The tweets include a link back to your status on Facebook via the new fb.me URL shortener. Read that as monster inbound traffic for Facebook.
Of particular concern will surely be the strain this will place on Twitter, as millions of users with both Facebook and Twitter accounts suddenly increase their tweet frequency. More on that from All Facebook.
Prepare to be seeing more of the Fail Whale.