Received a spam text message from this number requesting I add username to Yahoo instant messenger.

I receivd a spam text message from this number making it seem like i knew who this person was.  When I asked if I knew who s/he was, they replied for me to add their username to Yahoo instant messenger.

i received a text massage from this number saying to his to add him on yahoo messenger and he give me his yahoo ID wtf? can somebody tells me whats going on?

Just got  text from this numer saying they haven't heard from me in a while. Also asked how I was doing. I did a trace of the number, and it's not anyone I know. Creepy

Likewise.