Its common sense that active Twitter users have more followers than inactive ones.Changing the Twitter default to a personalized picture is one of the first changes users make to their accounts. But what effect, if any does putting up a personalized picture have? Online marketing company Hubspot analyzed over 9 Million Twitter accounts, and found that the average user with a personalized picture has 10x the number of followers as the average user without one. The Hubspot survey does not control for other variables, so it is impossible to say what effect switching you picture alone has, but nonetheless it is an interesting note. Check out more here.