They wanted the URL so they could add the post to their email newsletter using the Flashissue curation function.
What appeared a simple request ended up being a lot more challenging since Facebook does not make it apparent where to find the URL for post.
1. Go to your Facebook page e.g. https://www.facebook.com/FlashIssue
2. Click the Date Stamp of the post you desire to find the URL for
3. The post will load as it's own page and you can copy the URL e.g. https://www.facebook.com/FlashIssue/posts/928107223872038
Once you have the Facebook page URL you can plug it into Flashissue and drag it into your e-mail.
If you are using the Flashissue Chrome extension you can clip the Facebook page URL for a faster method to obtain it in your e-mail:.
Exactly what's more annoying is that there is no chance to discover an RSS feed for all your posts on a Facebook page. It appears like Facebook when offered this but withdrew it because it was being abused.
For the minute, you have to be pleased with pulling private posts as pages.
Thus the article What Is My Facebook Username thank you visiting from me hopefully can help you.