To send a message to Facebook and Twitter you must first link your accounts with the explore.garmin.com portal. Instructions for doing so can be found here.
Once completed follow the instructions below:
Note: Replies from Facebook and Twitter will not appear on the device. Replies from MapShare will route back to your device.
1. From the main screen select Social.
2. Press the arrow key up to select Facebook, Twitter, or MapShare. Press the to select the option.
3. Scroll back down Message and then press the checkmark key.
4. Compose your message using the on-screen keyboard and then select OK when done.
5. Select Send and the press the checkmark key.
6. The message will attempt to send.