Twitter is a social networking service that has an abundance of information for your career if you know who to follow.
100 Ways to use Twitter in the Classroom by degrees of difficultly
Follow these great teachers and technology people on Twitter.
NMHS_Principal
moodle
moodleific
rmbyrne
web20classroom
uniqsuseq
kathyschrock
web20guru
HaveFunTeaching
bizEducator
TeachPaperless
Larryferlazzo
PeterVogel
TeachaKidd
careeredunews
TechnologyToday
ARTeachandTech