Hi, Andee,
I've picked up a lot of UK and other international followers, too. When I tweet (which is rare, these days), I make it a point to tweet during prime 'day' hours, both here and abroad.
Insomnia is handy for things like that!
@Janine -- Hey! :-)
One of the first things I did after signing up was to search terms like: San Antonio, Austin, South Texas, etc., then choose people/businesses that I wanted to follow. Many of them have followed back. I also searched for interior decorators and designers, and a few other specific designations.
I've slacked off Twitter in 2014, so have lost some traffic. Time to do those things all over again and get active!