Someone asked me to suggest a few basic tools for Twitter. Here are a few I’ve found useful. They’re all reliable, free or have a free/lite version:
Work out if someone’s following you or not: DoesFollow
Find out who unfollowed you: Who.Unfollowed.Me
Find someone’s unique Twitter ID number: ID From User
Good all round Twitter management tool: Tweepi
And another one: ManageFlitter
Find out who you’ve blocked (and unblock them): Blocked By Me
Delete ALL your tweets: Delete All My Tweets
Share a document on Twitter: TwitDoc
Share a picture: Twitpic
Share audio recordings eg your voice: Audioboo
Share music: Blip.fm and Grooveshark
URL shortener: Bitly
Clean up your Tweet stream: Twit Cleaner
When 140 characters just isn’t enough: TwitLonger
Make stories with social media: Storify
Manage multiple social media profiles across different platforms: TweetDeck
Manage and analyse your Twitter community: SocialBro