While Twitter mashups continue their tremendous growth, there's another area we're also noticing blossom: APIs that are based on the Twitter API. It's a growing trend, and we now have 43 Twitter-derived APIs in our directory. These developer-created apps and platforms process data from Twitter, adding value, and in-turn share that back out for developers via their own API. In essence, the Twitter API is the basis for a growing stack of APIs. And it's one more way that the Internet Operating System will mimic OS's and platforms of the past: one platform builds on another, and another builds on that one, and on it goes.
We've written about some of these before, such as the mutual friends API and profile search API. We also noted data re-sharing as a Twitter API best practice in Twitter Developer Tips From the Guy Who Wrote the Book.
For reference, here are all 43 Twitter-derived APIs:
Auto Follow Friday API: Twitter contact listing service
BackTweets API: Twitter link search service
br.st API: Twitter web based client, url shortener and image sharing
Chirpio API: Social rating tool
FileSocial API: Twitter file sharing service
Foller.me API: Twitter user information service
follow cost API: Find the follow cost of a Twitter account
Intersect API: List mutual Twitter followers
JumboTweet API: URL shortener
Let's Be Trends API: Trend tracking on Twitter
Penolo API: Twitter sketching tool
ScreenTweet API: Media sharing service
Summize Twitter Search API: Search Twitter tweets service
SuperTweet API: Twitter analysis, metadata, and monetization services
Tagalus API: A dictionary for Twitter hashtags
tagdef API: Twitter hashtag definitions
Tipjoy API: Aggregator monetization services
TweepSearch API: Twitter profile search services
Tweet Scan API: Twitter and identi.ca search results service
TweetARun API: Get access to your running records that have been recorded on TweetARun
Tweetburner API: Twitter link tracking service
TweetFeel Twitter Sentiment API: Twitter customer expereince tracking tool
tweethook API: Twitter search data retrieval
TweetLater API: Twitter tweet scheduling tool
Tweetmeme API: Twitter link popularity service
TweetPhoto API: Twitter photo sharing service
TweetRL API: Revenue sharing twitter article service
TweetShrink API: Tweet shortening service
Twinfluence API: Twitter profile analysis service
Twitgoo API: Twitter image sharing service
Twitlbl API: Twitter data analysis service
TwitPic API: Share photos on Twitter
TwitrPix API: Photo sharing service for Twitter
twitsnaps API: Twitter photo sharing
Twitter Grader API: Twitter user ratings service
TwitterCounter API: Twitter user statistics data
Twittervision API: Location based data for the Twitter service
Twivatar API: Twitter avatar service
twt.fm API: Twitter music sharing service
Vidly API: Video sharing service
What The Trend? API: Twitter trending service
Zutual API: Twitter user comparison service
Zutual API: Twitter analysis service
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