Final answer:
The claim that 99% of social media users accessed social media via mobile devices since July 2020 is false based on the information provided.
Step-by-step explanation:
The statement that since July 2020, 99% of social media users accessed it via mobile devices is false. The provided materials do not contain any data supporting this specific figure. For example, a Pew Research Center report indicates that 73% of adults engage in some sort of social networking online, but it does not specify that 99% of them use mobile devices for access. In fact, the actual percentage could be different and is dependent on the demographic, geography, and period in question. Furthermore, smartphone ownership and social media use statistics provided by Pew Research and other cited sources describe a rich and varied landscape of technology use, but none corroborate the 99% mobile access claim for social media.