A guest post is an article written for another publication's audience; a press release is an organization's announcement of news. Both can help people discover useful information, but neither should be treated as a shortcut to search rankings. Google explicitly addresses link spam involving distributed press releases and large-scale guest-post campaigns. The sound strategy is to publish material that serves readers and to disclose commercial relationships and paid links.
Choose the format for the story
Press release
Use it when a verifiable event has happened or is scheduled: a launch, appointment, study, opening, or policy change. State the facts and supply a contact.
Guest article
Use it when a publication wants an original perspective or explanation for its readers. Follow its editorial rules and disclose a material commercial connection.
Owned explainer
Use your own site for detailed methods, product information, FAQs, or data that a short announcement cannot carry.
Keep links honest
Google's spam policies warn against optimized anchor text in widely distributed articles or press releases and large-scale campaigns whose main purpose is link building. If a placement is paid or sponsored, the publisher should qualify its outbound link with rel=sponsored or rel=nofollow. A naturally earned citation in a reporter's independent story is different from a purchased link in a syndicated copy.
Do not promise a client that ten releases or guest posts will produce a particular ranking. Search performance depends on many factors, and the mere appearance of a link does not show whether it sends readers, is indexed, or influences search visibility. Prefer a relevant source link that helps the audience verify or act on the content. Keep campaign reports clear about paid, owned, syndicated, and earned placements.
Measure value beyond backlinks
For a release, track whether the announcement reached relevant stakeholders, generated qualified inquiries, or led to accurate independent coverage. For a guest article, look at whether the piece answered a publication's audience question and brought appropriate referral traffic or discussion. Both can build recognition over time, but neither single item proves a causal ranking gain.
PRSA's ethics guidance calls for accuracy and disclosure. Before publication, check dates, source documents, author identity, and rights to any supplied image. Avoid posting the same promotional article to dozens of unrelated sites. A well-chosen publication and a distinct, useful contribution are more defensible than a network of keyword-rich duplicates that nobody needs to read.