[hobofan]

I'll throw in Reddit into the mix. For deeper discussions about projects, it has a way better interface than Twitter, and also as a "newcomer" you have way better chances if you pick out the right communities. One other factor is probably also frequency of posting.

While my posting cadence of "something interesting" every few months works well for Reddit, that's not something that gets people to follow and engage with you on Twitter.

[meowtastic]

I got a few really good exchanges on Reddit. But I always feel weird reaching out to people directly afterwards, I feel the platform isn't made for that.