http://blog.hubspot.com/marketing/open-graph-tags-facebook-twitter-linkedinhttps://blog.bufferapp.com/ideal-image-sizes-social-media-posts
http://www.brandigirlblog.com/2012/03/print-vs-web.html
http://blog.chasejarvis.com/blog/2013/01/the-new-horizontal/
http://www.tootsweet4two.com/how-to-make-a-horizontal-photo-a-pinterest-friendly-vertical-photo-using-picmonkey/
http://www.slrlounge.com/school/how-to-create-web-sized-image-export-preset-in-lightroom-4/
http://www.bonjourblogger.com/tutorials/how-to-make-an-instagram-collage/
1,024 x 512 px for FB
72 px resolution