You might own the copyright…

 

General Photography

but they make the money (and you won’t be seeing any). Key quote (my emphasis): “Image owners allow it to happen, though. Nobody forces them to accept the Twitpic terms of service. For many, it may well be a perfectly acceptable trade-off for a chance to share their images with the world. For others, the terms may come as an unwelcome surprise, but the onus is on Twitpic users to read and understand the service agreement when they sign up for an account.”