Here are some key features to look for while:
Views on primary topics – First, look at the main topics they discuss and then click on one of the bubbles to find all the tweets on the topic. Read through a few tweets to get the account user’s view on the matter. So for example if one of the main topics is “President”, you can read through the tweets to see if they are pro or against the president
Specific details of their life – look for topics in the small bubbles to find the errant tweets that reveal details about their life, so maybe the bubble that says “wife” will link to a tweet saying “…my ex wife….”
Find closest associates – look at main usernames that are in primary topics and (unless they are a celebrity), look at 5 of them in a row to find common features that can reflect the original account user.
Find relatives – use All My Tweets to list all followers and do a quick word search for the original account owner’s last name
The account’s first follower – this is often someone close to the user. Use All My Tweets to get a full list of the account’s followers. Scroll all the way to the bottom and you will see the first follower there.
Assess relationships – use Tweet Beaver to display “conversations” between the primary twitter account and its close associates. Do they interact or just retweet?
Location – If you cannot find the account owner’s location directly, consider looking for locations of close friends and family in their bios or Geo Social Footprint. Try to identify time zone based on Sleeping Time.
Are staff members tweeting – for famous / powerful individuals, the tweets sometimes come from the actual person or staff members. Often, tweets from the person come from a phone and at any hour while tweets from staff come from a computer during the day. Use Twitonomy to identify the platform used for individual or all tweets. If the tweet came from a phone (it will say “Twitter for Android” or “…Iphone” etc.) or a computer (“Twitter Web App”).