[Plugin: Wordbooker] Posting on fan page, no new post advert??

I ‘ve tried many facebook plugin and i decided to keep wordbooker.
I’ve just started my facebook fan page yesterday.
When i send a new post from my website, i found it on the facebook page immediately, but it seems that fan friends don’t receive any advert saying something like “a new article has been posted on ……fan page” on our facebook page.
Is it normal or not???

https://www.ads-software.com/extend/plugins/wordbooker/