this was suggested a few times already, nothing happened so far as you can see
mods are busy, they're doing voluntary work, needles to say they all have a personal life, projects to manage, it'd be a tremendous job for them to select and put the appropriate threads into the new Twitter section, there are more than 6,500 threads in the Social Networking section of the forum already
maybe if there'd be a way to automate the task, put the threads which contains twitter-related keywords (in their title) into a new section and it still wouldn't be perfect
try to create a poll, if it will get enough positive response, mods can forward the request to the admin and the owner