An avatar on Twitter is the small picture displayed in the top left corner of your profile.
Your Twitter avatar could be your brand logo or a professional headshot if you mostly use Twitter for business. The size of your Twitter profile picture should be at least 400 x 400 pixels, and max 2MB. The file format should be JPG, PNG, or GIF.
A well-designed avatar can help define your brand and spread it around the internet. Whenever you’re participating in some social activity online (e.g., commenting on blogs, tweeting, sharing a link on Facebook), you want to be recognizable. Having a constant avatar that gets shown every single time along with your input helps a lot.
