Google, Yahoo, Facebook and several banks have a session summary screen that lists a variety of information, but they aren't consistent in what is offered to the end user. e.g.
Facebook offers a concise "active session" list, and enough information to determine if that session should be terminated.
Chase bank, for example, lists how many transactions have been issued in the current session, while there is a larger (and overwhelming) set of options in Google.
Excluding the line of business details (as in the Banking app), what session information and controls (eg terminate session) should be included on a session summary?
Edit: The thought is that providing too much information in a session summary could be used by a malicious person or script accessing that page. e.g. an account could be hijacked, the password changed and all legitimate sessions terminated.
Other social engineering, or PII disclosure may also be possible depending on the type of attack.