In your Profile wall you can share your thoughts, images, website through your post.
Take a photo from a Facebook site or app then it will automatically post or you might have to click something that say's post to Facebook.
To post something on your own Facebook page, go to your Facebook profile, locate the "What's on your mind?" box, type your post, and then click on the "Post" button. You can also include photos, videos, or links in your post by selecting the appropriate icons before clicking "Post."
It stays until you remove the post.
in the chat bar
Get a blue pen and colour in your screen
You can't post something on Facebook so all the millions of users can see. Because you haven't got them all as friends, you can only post things on Facebook so your friends can see. But if you created a group or a "like" page then you can get a few thousand of people who are apart of said group or page to see it. Not the WHOLE of Facebook. Hope this helps!
click options and click delete post (;
You can't do that. You have to save the post and then post it on facebook.
To get the answer to this you need to look at the Facebook security information.
In Facebook, you cannot "like" something someone says on a chat. However you may "like" something someone says on a post or comment :D
No there isn't. They make these websites to post photos and chat. NEVER post private photos.
If you haven't done anything to your privacy settings, then your posts already should.