Who called from 4796890770

Repeated text messages asking to add on yahoo id

texts requesting I add them to my yahoo ID

Also getting texts asking to add on yahoo ID. Knew my first name?

I received a text from this number on 12 11 2012. They knew my first name. No further contact. Does anyone know what they are up to ? Somehow this has something to do with YAHOO.COM. Like other reports on this page  I Have a yahoo.com email address. Don't use it much. How do they tie that to my phone number? !