Mass-creating automated accounts
There are legitimate reasons why users may have multiple accounts. Automating multiple accounts for community benefit is permitted. For example, Twitter users can now find out when the Hubble Space Telescope passes overhead, whether they’re in San Francisco or Hong Kong. Such accounts are generally filtered from search results, as they often post similar updates across multiple accounts.
Creating serial or bulk accounts with overlapping use, however, is prohibited. Please file a support ticket if you have questions on appropriate use. Include the list of accounts and your planned use of each account; accounts with overlapping use cases are generally not approved. Users operating serial accounts must maintain them within the Twitter Rules, and violations may result in permanent suspension of all related accounts.