Never do that if performance matters

file.m

- (BOOL)twitterAuthorized {
  ACAccountStore *store = [ACAccountStore new];
  ACAccountType *accountType = [store
      accountTypeWithAccountTypeIdentifier:ACAccountTypeIdentifierTwitter];
  return [accountType accessGranted];
}

never use that in e.g. numberOfRowsInSection , cache the value and use it instead.