MediaPost announced today that Mogreet is putting video ads into MMS messages. This is a fascinating development, because people have been slow to accept advertising in mobile. In fact, mobile experts have debated for years whether text messages should be used for advertising at all, claiming that people see their mobile device as too personal and that advertising through text messaging would be intrusive.

If cultural norms around mobile are changing, that’s good news for marketers. Now the question is, where will people draw the lines – or put another way, what level of brand messaging is acceptable?

It looks like Mogreet will be one of the companies helping us find out.