Latest stats from heyo show that posts with 80 characters or less get around 60% higher engagement.
This has also been true of email subject lines. So keep your subject line short to maximise your emails being opened.
When crafting your email subject line act like you are emailing your mother.
If you are boring people will stop clicking on your email so provoke curiosity in your reader.
Hold their attention by building in the idea of scarcity in your email content.
Remember to use this same concept of short is sweet in your social media tool
Over 500 million people per day only use Facebook from their mobile each day so optimising your ads for your list for mobile to get the biggest success.