Anyway to create notifications activated by stimulus?

[urunmeri]

Is there any app or way to program an iPhone 5 to give off a notification once a certain thing happens?

To clarify: For example, say on the Facebook App, once a certain person logs on/off my phone will notify me although my phone is on sleep. Or on a messaging app, my phone will notify me once a certain person logs on/off.

 

[Applejuiced]

Nope, you will have to spend more time and work harder on your online stalking
You cant set the iphone to alert you when someone gets online or offline on facebook.

 

[SnowLeopard OSX]

No. As far as I know, you cannot tailor notifications to alert you on specific functions in specific applications. Maybe someone should make an app like this just for Facebook?