Saw on that social media website.
Post it
You cannot post to all the people on Facebook. It is a violation of the privacy settings of Facebook.
If you compose a message from your Inbox then it is private. If you post something on someone's wall it is not.
Post it on his facebook or youtube page
I think it means Post My Status. :)
ask him on facebook or twitter, message him and post on his wall(:*
If you post something on someone's wall ANYONE can see it. If you message them no one can see it.
Post on their wall, send them an message.
Do you mean from YouTube?
it mean Random Wall Post
It depends on your personal facebook texting settings. You can change these by going to account settings>mobile>facebook mobile.
Post impression is a count of how many times a post have been seen throughout Facebook (on your wall or on people's own walls).