Text Messaging and/or Social Media

Are there any programs that use a free or for fee text messaging service (i.e. Contact Wireless, Remind, Textedly, Bloomz, Sendhub, etc.) to communicate with their customers? How about Facebook or Twitter?  If you do and wouldn’t mind commenting on this blog post or emailing me at stacy.caudle@ktik-nsn.gov, it would be much appreciated!