Online privacy is a source of concern for most people, who desire to separate their personal lives from their professional work lives. Lucid categories people into 3 categories: family, work and friends for you. This way, you can see which group of people can view which posts.
Lucid uses the metaphor of filters, which people will be familiar with due to photo-editing applications such as Instagram. Users will drag the color corresponding to the group of people, to see through that group's lens. Users can also drag 2 sets of filters, for example to see which posts are visible to both family and co-workers. The top timeline allows users to change the calendar month to change their view from spacial to temporal.