The clever part of his challenge is he and only he would know which competition to do for the competitor and hence he would already have lot better planning on how to perform the task == lot more change of winning even if windows phone was slower.

I just tried sharing one of the photo in facebook using share plugin I had and seems like it isn't working! Maybe I have changed the facebook password since I last used the plugin or most probably the plugin is broken by now. I would have surely lost the 'who can post photo in facebook fast?' if I was a competitor.