said 1 year, 3 months ago:
On one of the pages I administer, I was giving out some page “love” today to the pages that liked the page. I was able to type the @ symbol and the name for a large number of the pages but was unable to do so for others. In a few of the cases I noticed ?ref=ts after what appeared to be their vanity URL. In a couple of others, I noticed that they did not have a vanity URL. What determines whether you can use the @ reference for the page and get the direct link to the page without having to include the entire FB URL?