Third-party Twitter apps are applications that are built to run on Twitters API platform but are not owned by Twitter. Hootsuite, Buffer, Klout and Pinterest applications are examples of legitimate third-party services that have apps which can connect to your Twitter account. Twitter Counter is a popular choice for startups and large firms alike, the Amsterdam-based outfit provides insights and promotional services with a scalable range of pricing plans. Users including Lionel Messi and Charlie Sheen were affected by the Twitter Counter hack.”]
Source: https://grahamcluley.com/lock-twitter-care-rogue-party-apps-dont-hijack-account/