The one line press releases will be displayed on , and throughout its website MuckRack.com, including links to multimedia, press kits and a more detailed press release.
The cost is $1 per character, with a minimum $50 charge and will be delivered to Muck Rack's followers through the standard method - a tweet.
The company has about 3,500 followers, so companies or brands with a wider remit could profit from doing the dirty work themselves.
However, a number of companies have taken up the service, including its own PR partner PepsiCo, plus Twitter toolbox HootSuite and the American Freestyle Motocross Association.
Muck Rack also promises some click metrics, using URL shorteners Bit.ly and Ow.ly.
Another website, pr140.com, has taken Twitter PR down a different path.
The company uses its own URL shortener, where public relations professionals can use with the long URL of their press release, turning it into a short URL with the pr140.com main domain prefix.
Journalists looking for leads have been known to search the #pr140 hashtag, the company said.
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