After following every twist and turn of Facebook’s corporate life in Ireland for the past two years, I would not necessarily expect anything new out of a set of annual accounts. Yet while there is indeed little surprise in the headline figures reported by the group’s main trading company here, lesser-known subsidiaries tell us a lot more. Facebook Ireland grew advertising revenue and staff numbers across the €40 billion and 2,000 marks respectively last year – in line with group figures already reported in the US. Facebook’s 15 Irish-registered companies reported nearly €880 million in combined profits for 2020 and…