We proposed it structurally how a tweet system could solve the problem in the organization. The tweet system in a company is used for a long term, and it helps informal communication. The effect by tweet in social media includes a self-effect or an effect of relationships. However, the study on tweet system in certain company is not found. The cancellation of stress and the uneasiness of the worker are problems of the organization, also big social problems. Therefore it is significant to clarify the effect that a tweet system brings. We performed a semistructured interview for users of the tweet system in a company. And we proposed the model that worked structurally and effectively at the organization. Specifically, we arranged contents provided based on a semistructured interview by using KJ method and gathered it in 8 factors. Furthermore, we proposed Effect-Problem-Benefit model by connecting those factors based on the knowledge of the precedent study. As a result, the tweet system in the company could build the place, and clarified brought effect of the relations construction, social skill improvement, and stress reduction on the place. Moreover, we proposed that the tweet system in the company brought the effect of the information sharing promotion, the restraint of workaholic, and the restraint of the motivation drop.

This paper is an attempt to clarify what kind of ‘subject’ we are formed by a fearful progress of ‘surveillance socialization’ in today society. In so doing, Foucault's theory, that formulated surveillance as a strategy or technology of ‘assujettissement’ by ‘Pouvoir’ (Power) or ‘Bio-pouvoir’ (Bio-power), is be used as a clue of analysis.

Currently, it can be pointed out that the way of surveillance is shifting from ‘Panopticon’ to ‘Dataveillance’ (data + surveillance) and then to ‘Pan-Opticon’ (the situation as all people is watching others and also watched by others). And it is also stated that ‘subject’ formed by surveillance is transformed by this shifting. That transformation is from ‘Discipline subject’ to ‘Risk-prevention subject’ and to ‘Self-care subject’. So, we are formed as ‘Self-care subject’ in the situation of ‘Pan-Opticon’.

‘Self-care’ means controling ours ‘data-image’ obeyed by ‘criteria’ grown from big data. But, it is different from Foucault's ‘souci de soi’, owing to it is operated in relation with ‘self’ as ‘data-image’. ‘Self-care’ can become the problem peculiar to today society, because it be demanded by ‘Pan-Opticon’ between ‘anonymous somebody’ (Sartre's ‘on’). Therefore, the current surveillance society should be thought by this perspective.