Microblogging is a ‘‘Mobile Web 2.0’’ service
category that enables brief blog-like postings from mobile
terminals and PCs to the World Wide Web. To shed light
on microblogging as a communication genre, we report on
multiple analyses of data from the first 10 months of a
service called Jaiku. The main finding is that microblogging
centers on selective, I-centered disclosure of current
activities and experiences, making daily experiences visible
for others. The high frequency of brief and mundane
status updates, like ‘‘working,’’ may be a second-order
effect resulting from posting becoming a routine executed
to keep the audience interested. The results highlight the
importance of reciprocal activity and feedback in users’
motivation to invest in this activity.