Digg to Reddit? Ha. Probably not what you were asking, I assume you actually mean within the same company? Tencent did a reasonable job of migrating a lot of

Digg to Reddit? Ha. Probably not what you were asking, I assume you actually mean within the same company? Tencent did a reasonable job of migrating a lot of people to WeChat from QQ, but then again QQ is also still alive and used, so it wasn't a full/complete migration.