What are the challenges Meta and Twitter $($which has been renamed $$X$)$ face in implementing a verification system service revenue model described in this chapter after they have used an advertising$-$based revenue model for so long? How does Meta$$s Threads complicate these challenges for Meta and Twitter $($X$)?($Note: Meta$$s Threads, a direct competitor of Twitter, started off without any revenue model at all, but with blue checks obtained without cost from its Instagram customers.$)$ Devise and describe an alternative revenue model for social networking companies. What are the strengths and weaknesses of the revenue model you are proposing?