We should be careful before copying everything from Twitter.
Manton had more to say about this today and I agree with him. Whether those of us who are driven in any way by ideological motives like it or not, the fact remains that copy-pasting functionality from the existing behemoths is a complete waste of time.
Why would anyone bother with your new thing if it just does what the existing thing does, only with fewer people? That is not an effective way to motivate people and we’re never going to change anything if we fail to understand how people are motivated to make changes in their lives.