Hi momznite,
It depends on what you’re using.
I’ll assume WordPress. If so, it’s very easy to filter out spam and setup comment approval.
– In your WordPress admin navigate to Plugins. You’ll need to activate the Akismet plugin that comes pre-installed with WordPress. In order for it to work you’ll need a WordPress API Key. You can get one for free here:
https://akismet.com/signup/#free
– Now, to make sure comments are only posted after you’ve reviewed and approved them, from your WordPress admin go to Settings > Discussion, next to Before a comment appears make sure that An administrator must always approve the comment is checked and then save.
If you’re using something different than WordPress let me know.
Thanks, Bryan