I have a LG vortex and when i send text messages to people it sends that text

message as a message on fb? I have a LG vortex and when i send text messages to people it sends that text message as a message on fb?
when i send text messages to people it sends that text message and sends it as a message of facebook to the last person i became friends with on facebook. how do i get it to stop! i think it might be some kind of setting or something. its not a virus because i have protection on my phone and facebook. and it doesn't happen all the time it's really random. please help me and tell me how to get it to stop, thanks!