Let's not get into a semantic argument of spam. Spam, noise, trash followers, whatever you want to call them. They are all annoying and not what Twitter or most users want in their service.
I'm unsure if a company HAS to pursue every trademark infringement to hold their trademark. Otherwise you could in theory make a company go bankrupt quickly just by setting up a bunch of shill companies using similar names and force them to pursue each fully in court. Also there is no obligation for Twitter to constantly search, identify and sue/ C&D/defend against every company worldwide that uses the name Twitter. Just seems silly. IANAL however and could be wrong. dave
