The phrase "a portion of its users" is correct and usable in written English.
It can be used when referring to a specific subset of users within a larger group, often in discussions about feedback, behavior, or demographics.
Example: "The company decided to implement changes based on feedback received from a portion of its users."
Alternatives: "a segment of its users" or "a subset of its users."
Clearly, Tinder needs to make a change to how this is enabled or risk alienating a portion of its user base before it rolls this out more broadly.
Twitter, of course, may not be in the position of needing a dedicated app for ad management at this point, but it seems that if it's going to dedicate this large a portion of its user interface to Twitter Ads in an attempt to increase revenue, it would be smart to allow users to craft Twitter ad campaigns from the mobile app directly.
YouTube's plans to convert a portion of its user base to a subscription-based, ad-free service known as YouTube Red appears to be gaining traction.
Anyone can sell tickets on StubHub, but a large portion of its users are brokers, or professional scalpers — not a very beloved constituency.
Mint originally released its investment tracking functionality to a small portion of its users, and will now be expanding the feature to everyone.
Last month we reported that MySpace was planning to launch a webmail service – a move that could instantly make it one of the web's largest Email providers (provided a substantial portion of its users took advantage of the feature).
Which, in the end, is the ideal but not always the reality for Twitter which has had some difficulty getting a large portion of its users to actually contribute to those conversations.
Hester-Amey noted that Zuckerberg had a board that was all white, and all male, even though Chief Operating Officer Sheryl Sandberg and a large portion of its users are women.
A portion of its 40 million users will need to re-enter, but not change, their log-in credentials.
Srinija Srinivasan, Yahoo's editor in chief, confirmed that Yahoo's marketing changes had led to action by a very small portion of its users.
