Press Release writer

looking for an excellent writer to write four press releases for an established social book marking site. Experience in writing press releases, perfect English style and grammar. The aim of the releases is to drive traffic to the site so they should have excellent selling points. The releases have to showcase the importance of the site and why users should register, presenting its value proposition. The releases then have to be submitted to all articles directory, blogs, directory, forums, social bookmarking sites...etc