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TwitLonger is a service to write messages longer than 140/280 characters.
https://www.twitlonger.com/show/$id, where $id is a partially? incremental ID like n_1srpv3s (n_1srpv3a is available, as is n_1srpv1s). It appears that no ID exists that does not start with n_1s. Identifiers are not case-sensitive.
It appears that all necessary data is stored in the page source code.
Stable. It introduced a subscription model in 2014 which gives users additional features like having their posts be ad-free and the ability to link 3rd-party analytics services, but is otherwise self-funded through ads.