The ability to mange the followers and who i followed across many social accounts. I think we rotated 50 key accounts in and out for maintenance.

I love being able to mass unfollow---people I'm Following that are not Following me back; foreign accounts; spam; and inactive accounts. I often hit my Follower ratio and being able to mass delete unwanted accounts allows me to get my ratio back in order.

If you need to just manage Twitter accounts, here's a ton you can do with ManageFlitter: manage unfollows, schedule posts and get basic insights (e.g. best time to post).