Web 2.0 was all about mashups and data api’s !, Some of the popular ones are google search api , twitter api etc.
All API’s have some rate-limiting , For example Twitter API has a rate limit of 150 requests per hour ! , Yahoo API and Google API’s have a daily limit on their requests.
The ultimate method of getting over this API request limit is to make a cache method which stores all data that is coming from API , Which you can refresh hourly, weekly or daily !
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