Yammer is a Twitter-like product that allows you to share updates with those within your company. Basically if you have company email, you can use Yammer to share updates with others with the same company email. i.e. Robert@Whatever.com could share updates with Sarah@whatever.com if they were both using Yammer.
From Plurk.com: “What is Plurk? Noun. plurk (plüer-kh) – A really snazzy site that allows you to showcase the events that make up your life in deliciously digestible chunks. Low in fat, 5 calories per serving, yet chock full of goodness. Verb. plurk (plüer-kh) – To chronicle the events of your always on, action-packed, storybook,… Continue reading I Pity the Fool (who doesn’t check out Plurk).