Hive seems to be working pretty well these days, but I figure there is always room for improvement.
Here are a couple of my suggestions - I'm sure others will have more:
When you post a tweet, have the system display the full tweet with any attached video or picture. Right now you have to manually copy the image and you can't seem to embed twitter video at all.
Get rid of the 15 character minimum on thread titles - it's just irritating.