It's really amazing how many times we see companies using the DMCA to shut down and stamp out fan efforts to help promote some content.

Take, for example, the latest situation pointed out by MG Siegler over at VentureBeat. Apparently, cable TV network AMC has been sending DMCA takedown notices to Twitter because some fans of its popular show Mad Men have created Twitter accounts for the main characters in the show.

The fans are staying in character and...