I really love the idea of it and appreciate your effort that went into creating this SDK, however, forcing my users to hand over their FB/Instagram/Flickr/Picasa handles to a 3rd party I can't testify for is a no go for me. There also currently is no info to users that their data will be centrally stored by chute in the app GUI, I am no lawyer but after the recent privacy backlashes it might be a good idea to add a note regarding this.
From my point of view, as things stand today with the current focus on privacy, such a feature would need to be completely device based or at least on the servers of the developer of the particular app itself. In another comment a little further down it was also hinted that the chute API might get a price tag at some point (with a free tier), these two things combined unfortunately make it unusable for me at this point.
Really love the idea though, hope we get to see a purely device based version of this at some point (by chute or somebody else).