Then came "sexting," in which people send racy pictures to each other with their cell phones.
And now comes what's being dubbed "chexting" - texting a person with whom a spouse is cheating.
The tabloids are full of unconfirmed reports that Tiger Woods and Jesse James did just that.
But does sending those text messages to those parties in and of itself constitute cheating? What if there hasn't been any actual sexual contact?
And where does the law stand?
Famed divorce lawyer Raoul Felder and prominent psychotherapist and Care.com contributor Dr. Robi Ludwig gave their takes to co-anchor Maggie Rodriguez on "The Early Show" Monday.
Felder says the law is still evolving in that area. He called it a "work in progress."
"Every lawyer," Felder said, "every divorce lawyer, will tell you that when the spouse comes in and complains about their spouse, there are other witnesses in the room. The other witnesses are all these text messages. It seems you can't commit adultery without getting involved in text messaging. And some of these are the most ridiculously intimate things."
"It makes cheating in the old days look really difficult," Ludwig pointed out. "There are so many boundary issues. It is really easy to send a racy text message. … It's certainly becoming more and more frequent because really your phone is becoming like your computer. It's almost like your personal biography, your personal diary. So you can really tell a lot about a person if you look at what's going on in their phone and as well as their computer."
To see the complete discussion, click on the video below: