It means Bookmark or Bump For Later. I wanted to mark that post so I can find/refer to it again . I am interested in what you had to say and want to follow up in the next poll.
Thanks FRiend.
Of course, good old Bump For Later. How could I miss that?
Foolishly I looked up BFL in the Urban Dictionary and found a reference to something being too late to be useful. So that should explain the context of my response.
But all is well now.