to manage life logs and share data among smartphones and
personal computers. It may be said that more information is
being shared with others than ever before due to the spread
of social media, yet the amount of information being shared
concerned with people’s personal lives is still insufficient.
For example, perhaps at some point you have known through
Facebook that your friend had caught a cold, but at the same
time did not know that your father, living far away, had been
suffering from a fever since the previous night.