Sequence Diagrams

Login page

Actor: Guest

Goal: Login to System

Preconditions:

• User must be registered.

Postconditions:

• User is directed to the homepage.

Sign Up page

Actor: Guest

Goal: Register to System

Preconditions:

• User must fill the each field of the sign up form or use Facebook registration.
• User must choose a unique email.

Postconditions:

• User is directed to the homepage.

Comment Creation

Actor: Registered User

Goal: Adding comment for a content.

Preconditions:

• User must be logged in.

Postconditions:

• User can add comment for any content.

Homepage timeline creation

Actor: Registered User or Guest User

Goal: Creating timeline view for user.

Preconditions:

• There is no precondition.

Postconditions:

• User can view list of contents that are available to him/her.

Group Search

Actor: User

Goal: Finding relevant groups with name and tags.

Preconditions:

• User must be logged in.

Postconditions:

• User can see the groups that matches the search keywords and tags.

Content Tagging

Actor: Registered User

Goal: Adding tags for a content.

Preconditions:

• User must be logged in.

Postconditions:

• User can add tag for any content.