When Rick was looking for wire to tie Michonne up I noticed he grabbed some Ethernet cable before changing his mind.
As you know Ethernet cable is used for networking/internet.
I think the writers choose Ethernet cable to symbolize the internet hate Michonne was receiving in the first half of season 3. I remember many negative comments early on about her failure to communicate, and sullen character portrayal.
By Rick choosing the Ethernet cable it showed that Michonne would be bound by the negative internet comments. However Rick changed his mind which was the writers way of saying they don't care about the internet comments and they would continue to write Michonne their own way.
Edited by zombiehunter, 22 May 2013 - 01:31 PM.