#1 Message Preview on Lock Screen
When you are writing your message, note that when it is sent out it will appear as a push notification on a recipients lock screen. Keep this in mind in case you want to have a teaser in the first part of your message that will appear on a recipients lock screen to increase your open rate. If you are including a media attachment, this will also appear in the preview on most devices.
A good strategy may be to write the beginning of your message as if it's coming from someone the recipient knows. For example: "Hey John! Did you see this? Everyone is talking about how *insert issue/event/call to action*