Free Republic is worlds apart from what those social media platforms are. You really can’t compare. FR is basically the dark ages and simply a format to post articles and comment. Not really a lot of easy interaction, not in the same way.
I have not been on Gab much at all. I got signed up but it was lagging so badly with all the new traffic I didn’t hang in there, waiting until they got more juice.
That is unfortunate you are running into antisemitism. You should report it to Andrew, he would want to be made aware.
I can certainly compare the conservative nature of the content posted and the posters commenting, all in order to respond to the “echo chamber” description.