Author here. That seems reasonable. However, spending 5x/revenue $ seems a lot more. Twitter could also spend some of that money on getting more eng hires to ma

Author here. That seems reasonable. However, spending 5x/revenue $ seems a lot more. Twitter could also spend some of that money on getting more eng hires to make their advertising product easier to sell vs only focussing on sales/marketing. Also, Twitter's biggest challenges have been on the user growth side - so it was surprising to me to see that their SBC spend on R&D is trending lower vs their sales/marketing spend.