Unique page titles

[henrywright]

Some pages don't seem to have unique <title>Page titles</title>:

• example.com/users/online
• example.com/users/latest
• example.com/users/sort-posts
• example.com/users/sort-reputation
• example.com/users/map
• example.com/users/search
• example.com/chats
• example.com/register
• example.com/login
• example.com/reset
• example.com/categories
• example.com/groups