i met him september 2011 through online, after a months talking online he came visit me november 2011 and he planned to see me again february 2012 then filed I-29f petition right after his 2nd visit then continues seeing me from february to may.
For the interview at the embassy we had copies of us on Skype, a few emails and more pictures of us together (from our first visit), they only looked at a few pictures and that was it.. of course I was there which is pretty good evidence ;-)