Writing press releases for your business, whether it is online or sticks and bricks, is an important part of keeping your business current and people informed about your recent activities. If your business is online, it is imperative to write optimized press releases so that the search engines can see that your web site is current, and is being discussed outside the context of our own site. If you are writing press releases just to point to your site, and do not care much about the content of the press release, it is OK to publish one that has not been written by a professional writer, but if you want your content to be seen by the public and read well, consider hiring someone who is an expert at writing optimized press releases.
There are web sites that publish articles as press releases, and they can be found by searching for them on search engines. Press releases should use keywords that have been repeated a number of times (at least three for 150 words), so that the search engine knows where to put your press release in their pages. Of all the things you can do to optimize your website, frequent press releases are probably the best thing you can do.
