I have been running this for a year on my old HP EliteDesk 800 SFF (G2) with 64GB RAM, and it performes great on the smallest models (up til 8B) only on CPU. I run Ollama and OpenWebUI in containers/LXC in Proxmox. It’s not as smart as ChatGPT, but it can be suprisingly capable for everyday tasks!
It has RSS built-in, but since it is a static site generator, it does not support ActivityPub out of the box. But I do think I have seen implementations with some custom JavaScript.