Loosing vast amounts of historical posts or would I say "cultural heritage" is a shame but I couldn't trust the party hosting it ...
So with Twitter I did the same, 13 years of tweets. Even took a one month payment on a bulk erase / unlike / unfollow / unretweet service to get it done in a reasonable amount of time.
I wanted it to work because of its place in the timeline, before everything else and provide more history.