By way of
estoy = I am hablando = talking con = with un = a amigo = friend via facebook is the same in English So it means "I am talking with a friend via (over, through, by means of) facebook"
Via facebook
You can search for a facebook user via the search bar
download the facebook app
you send the message as a picture message to the facebook number.
retired from facebook
Sorry, You Can't. That's The Odd Thing About Facebook.
You cannot create a Facebook ID on Gmail. Facebook ID can be created on Facebook via Gmail. The confirmation mail is also received on Gmail.
Yes '
yes via facebook
As of October 2012, no turtle emoticon has been released via Facebook chat.
Apple probably stopped funding that feature. So sad :(