can i make a warning in my blackberry(plzz read inside)?

[I got all the JUICY]

can i do like warning in my blackberry when ever demi lovato, john mayer, etc tweeted in twitter and now i am not in my state i'm in Saudi Arabia cause my daddy has work here and i don't know how to do that or even if it's possible like when demi tweeted a sound would come out of my bb and i'd be notified


tell me if it's clear enough!!
i have a Blackberry Bold 9700