There are lots of sites offering additional services to Twitter:
- hashtags.org
- tweetmeme.com
- repeets.com
- dailyrt.com
- backtweets.com
They all have something in common: They seem to get all updates from Twitter. Otherwise, they couldn't offer such complex services with high quality results.
But how do they do this? Twitter has a XMPP feed (Firehose) but not everybody is allowed to get data from it.
Are there any approaches you can recommend or which you think they are using? The normal API is limited too much, isn't it?