Some time ago we reported
applications that allowed users to find out when a friend came online on
Facebook. Following Facebook book updates those applications have stopped
working and for some time now many have requested a new application be offered
that could provide a similar service.
Chat Alert is a new application that notifies you when a friend (or
girlfriend/ boyfriend) comes on Facebook, or get an email, SMS
or private message when a user switches from offline to online in the chat.
Everything you need to do is is at this address: http://apps.facebook.com/chatalert/, authorize
the application and start to configure it. The first step is to choose the friends to monitor by
clicking on "Add friends to your alert list." Now you can choose for
each user added, such as receiving notifications: an e-mail to your personal
mailbox, a message in Facebook inbox or a text message (the latter is a paid
service).
In the basic version (free) you can monitor up to 5 friends. The
service will monitor the friends you choose and will promptly inform you when
they come online.