@ton Good idea. Most of the accounts are already in Wikidata, I'm still cleaning some mistakes I found there and I'll link the query then.
I'm not sure how to add all European Commission handles on Wikidata because not all offices and initiatives have their own item. Maybe I can just upload a CSV to Zenodo under CC-0. (I also wrote the EC asking that they do it themselves.)
@ton Discussion on whether to include such links from #Wikidata items.
https://www.wikidata.org/w/index.php?title=Property_talk%3AP2002&type=revision&diff=1615799166&oldid=1598092943