Just a quick thought for now in-between reserach for other articles... 

Since the start of this week, I've received nine separate asks for donations or sponsorship from different people doing all sorts of cool things for the causes they support. All of the asks have been via social media and all but one are from connections I have, but that Iwouldn't call close. I checked a few individual's tweetstreams and it appears that they sent quite a number of (the same) asks to their contact lists.
I have no problem with people asking for support, I just wonder how effective it is when we try to scale-up our social media contacts like this?