Even though i have stated in the beginning of this semester that i would use my page on lecturer server to display any information related to my class, most students didn't pay attention to it. So i tried to make them a mailing list at GoogleGroups so i can announce it once and they will receive it on their inbox. That didn't work either, because they rarely see their email (strange thing actually, because some of them have dedicated Internet access, but they don't use it for something good. Instead, they use it to play online games).
So finally i tried to announce things via Facebook and it seems that some people does take a look on my status. It's just a good way to use the social network site to announce things