I have set up a XMPP bot that connects to Facebook XMPP server, and monitors my friends login and logout operations.
For now i am only monitoring presence, but another's aspects could be easily derived and/or monitored :)
Chart values: - "1" means that the user has entered Facebook - "0" means that the user has logout
**Chart lines: - "\" lines means a user session, user logins and a time after the user logs out - "/" lines like this, means the user is entering Facebook after being logged out - "V" the formed V's represent the user login and logout history
Note: this post only contains data from 15:30pm to 3:08 am, from first monitoring attempt.
Data from 15:30pm to 3:08 am
Platform raw chart page
The platform im using to upload sensor data is sawa (related to sensors), no need to create databases, just upload data and then render chart :)