[Air-L] Buying tweets ?

Hello everybody, Help needed. Does anyone have experience with buying tweets from Twitter for research? We have a fairly specific query and would like to know which information is given about the tweets harvested through the query (e.g. is language or geographic information given for tweets, even if it isn't part of the query - so not a selection criterion)? Many thanks. Best wishes, Sandrine Sandrine Roginsky Associate Professor Faculty of Economic, Social and Political Sciences, and Communication Institute Language & Communication, PCOM / LASCO