I'd second this. Although from memory (and I didn't re-check this so I might be wrong) Twitter's API has quite strict user limits, in order to prevent third party clients from gaining significant marketshare (and thus spoiling their carefully planned curated feed to raise user engagement, with ads injected throughout).

I think that has proved an issue for "alternative" Twitter apps in the past, or at least did for quite a long time.

Yes, this is a problem, especially if the app becomes huge. They also have some strict rate limits. For ex: The endpoint to get mentions is restricted to 100,000 requests per day, which is very less for a popular app. There are ways to get mentions using their search endpoint which has a more lenient rate limit but it is an inconvenience and a bit hacky.

Thank you for the feedback. I wanted to test the waters with a quick web app before building a mobile app.

Check out Tweetlogix. I bought that app, been using it for months now, I like it