an expression used to illustrate the (limited) interchangeableness of two popular social networking sites, which is amplified by the facts that each site's title is a compound word and one of the words compounded into one site's title rhymes with one of the words compounded into the other site's title
A combination of the social networking sites MySpace and Facebook where you can avoid having to actually get out of bed to see your flatmates or find out about the lives of people you once knew.