Do you know any software that does ...?

Dude,
Welcome to Warriors forum !

Have you ever thought of it this way,
So they share the posts on their wall,
so they invite some friends,


what is to stop them from passing the info from the buyer to all his friends???

Trust me, you can't control
all of them from doing this!
I tried, I failed too!
No sales = marketing useless !

Do not rely on that way,
the only idea I can really give you is
to set up a personal fanpage,
build your profile slowly on facebook ,
add to your credibility and sell to many more.

After setting up the fanpage,
get to fiverr and ask them to send
likes to your fanpage to build credibility.

Then, you can budget maybe
$50 for facebook to send clicks
over to your fanpage.

or

Put up an ad on facebook
introducing your product,
try it for a few days
and see the conversion rate,
if it is good then continue,
if not terminate.

Easy!

There are many ways to use
facebook and other social medias
to market your product,
so try them out!

If you want to continue your current way,
you can try it,
but the results might be a little painful....

Just my point of view though...

Hope I helped, good luck getting your sales !