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I get ' top tweets ' from twitter as an RSS feed in xml format . There is a guid field in that xml format. There is a long 11 digit number at the end of guid field , is it unique for every tweet ?

+2  A: 

GUID stands for Globally Unique Identifier, so yes.

ceejayoz
i wanted to know that " is the 11 digit number ( substring of 'string guid ' ) unique for every tweet ? "
Anand Kulkarni
Again, yes. That is the tweet's GUID. Other (non-RSS) API calls may expose the number on its own without the full URL.
ceejayoz