The next Socialist Party of Ireland was formed in Belfast and Dublin on 28th May 1949 and associated with @OfficialSPGB and the World Socialist Movement.
The 1949 SPI later became the World Socialist Party.
Here's their manifesto: https://www.leftarchive.ie/document/419/
The contemporary Socialist Party was formed in 1996.
It arose from the Militant tendency in Labour and the Labour and Trade Union Group in the North. Its members are part of Solidarity, and it's affiliated with International Socialist Alternative.
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!