The rules including the Digital Markets Act (DMA) and the Digital Services Act (DSA), require online platforms to do more to police the internet for illegal content.
Companies face fines of up to 10 per cent of annual global turnover for DMA violations and six per cent for DSA breaches. Lawmakers and EU states had reached a political deal on the rules earlier this year, leaving some details to be ironed out.
The European Commission has set up a taskforce, with about 80 officials expected to join up, which critics say is inadequate.
Last month it put out a 12 million euro ($12.3 million) tender for experts to help in investigations and compliance enforcement over a four-year period. EU industry chief Thierry Breton sought to address enforcement concerns, saying various teams would focus on different issues such as risk assessments, interoperability of messenger services and data access during implementation of the rules.