Debut was the name of the game this week. Costume National celebrated its first appearance at Saks with a trunk show, Folli Follie unveiled its new Soho store with a shopping soiree, and Zac Posen hosted the launch of Belvedere Bloody Mary over brunch at Le Caprice.  Take a look! More»

Twitter has become an open diary for celebs like Ellen Degeneres, John Mayer, Ashton and Demi, and even Oprah, but what about our NYC Socialites? Think they are more closed off about their whereabouts? Think again. Below, a list of our favorite socialites to follow on Twitter.

Derek Blasberg - @dizzyblazeberg By far the most prolific tweeter. From front row at fashion shows in Paris, to cocktail parties in L.A., Derek isn't afraid to share his whereabouts. It's hard to keep up with the fabulous tales of this style writer, but that doesn't mean you won't want to try.

Rachel Roy - @Rachel_Roy: The designer/wife of Damon Dash has more style than she knows what to do with. Thankfully, she shares her creative talents on twitter, often in the form of twit pics.

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