One thing I have noticed with FB Messages is that if you have a lot of messages (about 410k messages over the span of 3-4 years) its really hard / impossible to actually get all the messages back to the beginning. When I try to download my FB data it actually just leaves the conversation blank with 0 messages. (In the past it would dump everything it could get leaving it incomplete). I have also tried getting the messages via the Graph API but have hit the same limits that after x time it would just timeout and not get any messages. Which really sucks because I wanted to do some analysis and archiving of the messages.
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One thing I have noticed with FB Messages is that if you have a lot of messages (about 410k messages over the span of 3-4 years) its really hard / impossible to actually get all the messages back to the beginning. When I try to download my FB data it actually just leaves the conversation blank with 0 messages. (In the past it would dump everything it could get leaving it incomplete). I have also tried getting the messages via the Graph API but have hit the same limits that after x time it would just timeout and not get any messages. Which really sucks because I wanted to do some analysis and archiving of the messages.