Collector helps you get pictures from people. Maybe pictures from last night, a candid shot of you now, or other pics of interest.
Collector achieves this by providing a [Send me pics] button for each contact in your phone book. The contact does NOT need the app.
Pressing the button gets them to send you some pictures.
You can send the request before an event, in anticipation of good photo opportunities.
You can send it after, to collect all the shots hiding in people's phones.
The pictures can be of you or someone else, new or old, still or motion (i.e. photos or videos).
Once again people don't need the app to receive your request, and respond with pictures.