Some IM services provide video calling, file sharing and PC-to-phone calling and allow users to switch back and forth. See text messaging vs. instant messaging. To use instant messaging ...

Text messaging and instant messaging are similar because they are both used to send text messages. However, text messaging ("texting") uses the cellular phone service, whereas instant messaging ...

Offer your best promotions and get to the point, already -- or customers will unsubscribe just as quickly as they opted in to receive your instant messages.