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Andy, issuing ten releases over three months is absolutely fine. Some of our clients issue many more releases - it tends to vary by industry but two or three per month is not (at all) uncommon. Our research shows that unless you use a premium wire (say prweb's advanced service or prnewswire etc.) your news won't get picked up elsewhere (or if it does, it will have been scraped onto poor quality sites). The links you get from the releases are really from the press release distribution service and (if you had a good story and used a premium wire), from the few news sites/blogs that cover the story and link to you. The link on the wire service is okay, but gets buried quite quickly.