text msg. culture

I often wonder about what is the propper thing to do about when you send or receive text message, like for instance when i send my aquaintances , friends and family msg.
Sometimes i dont get a replie when i have asked about something or send information that should be relevant for them. Then i give up, after a while with this lack of response. Maybe they never get my message, maybe they think that i should call them.. I dont know.

Also when i am with someone, and i dont put my phone on silence etc. Hmmmmmmmmm
maybe one should make some rules for whets "the right thing to do"