I have a multisite instance of WordPress, and I need to add 50 existing users to each of 20 new sites.
One by one is going to take a very long time, and will send each person 20 emails confirming that they have been added to the blogs.
Is there a method I can use to easily add man existing users to a site at once ? What how about SQL statements to insert into the database directly ? I can do that if I knew which table(s) needed to be inserted.