@vir7 thanks! Yes, that site from the Russian guy (http://feed.exileed.com/) is amazing. You can get an RSS for almost anything.
@lgnhnyctt you're most welcome. I'll give you another tip. When you find a Twitter list that interests you, don't merely use the list URL into Mass Planner -- which you would put under Follow Tool > Follow Sources > "Follow members from provided Twitter Lists." What you need to plug into MP is the URL for the subscribers to the list. I'll give you an example:
Say you want to grow your followers in the marketing ecosystem.
Do NOT follow this:
But rather, do follow this:
This way, you'll start gathering followers that are interested in the marketing topic.
Ciao for now!