The various distributions show that the validated accounts are those that have a greater number of friends (top left panel), use greater number of hashtags (bottom left panel) and write more messages (bottom right panel). Interestingly enough, the validated nodes are not the most popular, i.e. those with the highest number of followers (top right panel). In order to check the most popular accounts, we focused on accounts with more than 106 followers. In fact, the number of their messages is extremely limited, while their use of hashtags is extremely focused on their activities. This may be related to their strategies, to remark the exclusiveness of their products. More details can be found in the main text.