Your Dynamic Circles are automatically updated with the followers matching your criteria of selection (up to three criteria saved for each Dynamic Circle). This is why we call them ‘Dynamic Circles’ versus ‘Static Circles’ (like on social networks where you need to select and add manually new members to each group, list, etc.). It means you can promote massively your Website and / or ads to get many followers for being able to communicate massively or to only a few targeted ones (which have updated one or more Dynamic Circles automatically).