AreejMastodon noob question: How do I follow folks who are not IN my same server? So in my case, folks who aren't part of seocommunity.social
Simon Cox 
@areej in the search put their full name and instance - so John Mueller is @johnmu and gave a trawl through https://seocommunity.social/directory and https://seo.chat/directory but you can also follow people and tags as they appear in the feeds. :)
