When was the last time you really put some thought into how you're presenting yourself - or your brand - through your header image? Are you making the most of the space? Are you capturing the core of your brand? Are you directing visitors to a particular link - without setting off the spam alarms?
Whatever your aim - a call to to action, awareness for a new product, to show off your creativity, or simply represent your brand well in just one shot - make sure to give it some thought and DON'T just throw up the first picture you find that fits the space.
Take a peek at these "20 Brilliant Twitter Header Image Examples" compiled by the folks over at Hubspot.