When i want to send a picture or an article.. everything ...it appears a message like"can't send message... smth went wrong..please try again"
You may not have done anything wrong. There could be a problem with Facebook, the app itself (if applicable) or it could be something as simple as restarting the device your using.
I noticed that If I copied something to share on my wall and I paste it, it will not display until I post it. Not good if you want to pre-edit or make changes as you will have to do it after you post it.