ReadWriteWeb

Facebook has just launched a neat new trend mapping tool, called Lexicon. Similar to Google Trends, it allows you to create a trend graph for different words and (two-word) phrases on Facebook Walls. It has a surprisingly slick UI too, with the scroll bar enabling you to zoom in and out to get different views of the trend line. You can compare up to 5 different trends by separating words/phrases with a comma.