Im not familiar with twitter but my users may be…
I dont have that many new posts per day (max 1-2 on a heavy day) in my forum but I have a relatively huge userbase but the dont come regularly. To inform these not regularly visitings users about new post I thought I would auto post to my twitter account they could follow if they want to…
It seems like there are many services that can handle that job.
As a free service - what to you recommend?
Zapier is a good option. It easily integrates with both discourse and twitter
I would also recommend Zapier.
Maybe turn on daily summary emails?
+1 on the email digest.
My personal experience of Twitter is that people who are engaged and active on Twitter will rarely follow an outbound link and leave Twitter.
We are using IFTT, by using the RSS to Twitter applet. Discourse supports RSS out of the box, so this might be a nice free option instead of Zapier.
But, I’m interested to hear any other free options that you are aware of. 
I implemented Zapier, but it does not quite work the way I would like. I am gonna try out IFTT shortly, and I will let you know the results.
I would also recommend Zapier.
But I have changed the default rss by adding a short description at the top as well as other fields. You can try it out by replacing the value of the ?url= with your domain
https://api.thuvienmuasam.com/rss/?url=https://thuvienmuasam.com/latest.rss
I did now sign up and test IFTTT - then we will see if anyone will use the service at my site - but now it is there… 
Thanks for the replies!
Its a very simple service - no tags are added. Not the XX first chars of the post. Just the link. But well - very simple to setup
Here how it looks like - if anyone would like to know:
I’ve used IFTTT over the years, including RSS to various targets, and can recommend them. They started charging recently but I think you can still have a couple of basic “recipes” free. I don’t recommend Twitter though