Hi dear, I'm 5 years experienced c#.net developer. I have already done this work for facebook, twiiter, pinterest. I have good experience of working with their apis and also I can extract data from facebook from pages, user groups, likes, using graph api . as you have mentioned that you need a poster so I can do it for you by implementing OAuth.
I can do it in 2 days and we can further negotiate over price.
Looking forward to hear from you.
Regards,
Sohaib