Jupitermedia Corporation has purchased Mediabistro.com, a site that originated from the founder organizing cocktail parties and networking events for media professionals and eventually grew to include vertical-specific job listings and content. Jupitermedia is paying $23 million for the site which had 600,000 unique visitors last year and generated revenue from employer listings and premium content subscription services. Jupitermedia also owns internet.com and graphics.com, both of which offer a similar range of content and services.