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Thanks @abh12345!
Well, up to this point the data does not deny this suspicion, but it also doesn't clearly prove it. I was hoping for a clearer picture, but I guess it needs a more detailed look :/

number of unique authors submitting translations and social prior to switch off.

200 / 30 ?

Number of unique authors who were Translating and are now 'Socializing'.. :)

0 / 60 ?

Is it 30 more, or are the extra Social contributions coming from just one or two? No idea who.... :p