Communication lines

I recently asked the staff at NCBC to send different "lines of communications" that they use.
Here is that list:

- email
- postcards (snail mail)
- word of month
- phone
- web sites
- bulletin boards/message boards (physical)
- pod cast
- Street signs/street bill boards
- radio adds
- tv adds
- face to face conversations
- body language...
- sign language
- telegraph
- Walkie talkie
- CB
- Two cans connected by string

What are some other lines that you use? Do they focus on bulk communication or individual communications