If your posts on Facebook are consistently being marked as spam, there are several steps you can take to try and prevent this:
Review Facebook Community Standards
Make sure that your posts comply with Facebook's Community Standards, https://transparency.fb.com/en-gb/policies/community-standards/spam/ . This includes avoiding content that goes against their guidelines on hate speech, violence, nudity, and other prohibited content.
Limit External Links
Excessive use of external links, especially to suspicious websites, can trigger spam filters. Try to minimise the use of links in your posts, and ensure that the ones you do include are reputable.
Build Credibility
Actively engage on the platform by participating in discussions, joining relevant groups, and sharing content that is meaningful and relevant to your audience. Building credibility can reduce the likelihood of your posts being flagged.
Avoid Overuse of Hashtags
While hashtags can be useful, using too many or irrelevant hashtags may make your posts appear spammy. Keep your use of hashtags moderate and relevant to the content.
Check Account Security
Ensure that your Facebook account hasn't been compromised. Change your password regularly, enable two-factor authentication, and review your account security settings.
Report the Issue to Facebook
If you believe your posts are wrongly marked as spam, you can report the issue to Facebook. Go to the post, click on the three dots (...) for more options, and select "Find support or report post." Follow the on-screen instructions to report the problem.
Verify Your Account
If you haven't already, consider verifying your Facebook account. Verified accounts are often given more trust by the platform.
Adjust Privacy Settings
Check your privacy settings to ensure that your posts are not set to the most restrictive settings. If your posts are set to "Only Me" or a limited audience, it might trigger spam filters.
Contact Facebook Support
If the issue persists, you can contact Facebook support for assistance. Visit the Help Center and navigate to the "Support Inbox" to submit a request.
It's important to note that Facebook's algorithms are continually evolving, and sometimes false positives may occur. If you've tried the above steps and the issue persists, reaching out to Facebook support is your best option for personalised assistance.