You can no longer tag other people's posts. This has been a mixed blessing. It stops people adding insulting tags which is good, but sometimes the tags used aren't the best.
For example this thread.
It's about the far right in the UK. It was started by Centrox and he tagged it with the names of those individuals banned from the UK. Other tags would be so much more helpful, like UK politics, Far right politics, Britain, EDL, UKIP. Lots of things.