At first Facebook seemed to eat up Fotolog because of novelty and being able to do just a bit more than uploading pictures, but right as it did it decided to bloat and destroy the feed so people had no way to share pictures and be seen. That's when Instagram became huge and then got acquired by Facebook - because you had a place to share pictures again. Then they felt threatened by Snapchat so they added disappearing content and now they feel threatened by TikTok so they're mainlining video. The end result is that there's no active social network for pictures anymore - it feels like a good time for a Fotolog to come back, to make an attempt at memory permanence and small community connection instead of massively reaching disposable video.