What does "yam" stand for on twitter?

People who use Twitter and Yammer, can import their Twitter updates into their Yammer streams. #yam is a hashtag. Basically it's like having a facebook and myspace accounts. If you do not want to type in a new status on both you would type in a hashtag in front of your facebook post and it will automatically update your facebook with the same post. :) Yammer is a social network used by mainly fortune 500 companies to relay info within the same company structure and not public like twitter.