I don’t know how many users reddit has, but it is a lot more than lemmy. Lemmy is quite small in terms of number of users.

But I think focusing on relative numbers of users is a mistake. Forty thousand people is still a lot of people. And we can see that it is enough people to create a vibrant community with a steady stream of good content and conversations. So the fact that it is small compared to other social media is not really relevant, in my opinion. Having a thousand times more users doesn’t make things a thousand times better - that’s for sure.

(That said, I do think its worth noting if the number of users is going up or down… because if there was a significant downward trend, that would be a bad sign.)

I’m not sure about Lemmy, but I found this post to be a good explanation of how Pixelfed interacts with Mastodon.

Based on what it says there, I wouldn’t really expect it to play-nice with Lemmy though. We might be able to access Pixelfed posts here on Lemmy, but almost certainly not the other way around - because Pixelfed requires an image in every post.