You are developing a web application where users have the ability to follow one another. Due to the nature of the application, some users will become more popular than others, leading to frequent data requests for their profiles. Presently, user data is housed in an RDS instance. To enhance the read performance, your Developer has suggested employing ElastiCache as a caching layer. However, storing the entire dataset of users in ElastiCache would be prohibitively expensive. Therefore, you need to cache only the profiles of the most frequently requested users. Given that the website experiences high traffic, it is acceptable for the cached data to be slightly outdated, provided it is no more than one minute old.

What caching strategy would you suggest implementing?