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I followed the prices of Bitcoins during this day, but I am actually very cofused as to why Preev reports it always about $70-$100 less than Bitcoinity. News websites say the price soared to $900 today, which fits Bitcoinity's chart, but I also see people on the BitcoinTalk forums saying it is $500 now, which fits Preev's.
I understand Bitcoinity says that "the big number here is the price at which last trade was made". But since I also understand there is no institution that decides an "exchange rate" for Bitcoins, could I assume it as the price of the last trades? Why such a big difference?
EDIT: Now Preev is reporting more, but it is still a big difference compared to Bitcoinity. Just as a reference, when I wrote this question, Preev was reporting about $510, whereas Bitcoinity $600.
Now I see Preev says if you scroll the page: "The default data source was changed to Bitstamp due to problems at Mt.Gox (used by Bitcoinity) that have been causing the Mt.Gox price to differ significantly from the prices at the other major exchanges." Thank you! – None – 2013-11-20T04:41:13.520
bitcoinity uses which ever exchange you tell it to; unless you actually have funds at mtgox using their bitstamp graphs are currently more representative. – dchapes – 2013-11-20T17:13:08.383
Both Preev and Bitcoinity allow you to show the current price of MtGox and Bitstamp (Bitcoinity also a few others). – Murch – 2013-11-21T00:39:08.367