If you aren't familiar with Reddit, it's a social media site that works a lot like the "electronic bulletin boards" of old. You pick a topic you like, called a subreddit, and subscribe ("join") to keep up with what's posted.
An "r/" in front of the name means it's a subreddit, like one of my favories: "r/genealogy." Click here for an example of the kinds of helpful threads (conversations) you might find.
Most posts are really interesting, though some you may scroll right past. You can post your own questions or topics (though some subreddits require you to have reached a certain level of participation before you can start your own threads) as well as replies to the main topic or to any of the people replying. You can access Reddit on your computer or use an app on your mobile device.
Other subreddits you might enjoy: r/DNAGenealogy; r/FloridaHistory; and just for fun, r/GenealogyMemes.