This is the Use Case diagram:
According to the Use Case Diagram, the Activity Diagram are drawn as below:
Accounts Setting and Register:
Setting preferred social network accounts and register on Uni4One at first time, otherwise users can modify the accounts.
View Social Information:
Select different frame to browse different information on multiple social platforms.
Compose New Post:
Send a new post to a particular social web or multiple ones.
Friends Connection:
Connect same friends automatically and/or manually.
Key Words Searching:
Type key words to get search results.