Your email subject line matters. 47% of people open emails based on the subject line alone, according to research done by Business2Community. Because of this, marketers ask us about email subject lines often. And one of the most common questions we hear is this: What’s the best length for a subject line? To find out, AWeber’s team of email experts analyzed 1,000 subject lines from 100 of today’s top marketers. Here’s what we discovered. What is the average length of…