If a Twitter application claims to do something that is not supported by Twitter API, then it is probably a scam. I got this idea from Dhananjay Nene a long time ago, when an application claimed to be able to find out who has viewed your Twitter page.
Quite a few people used an app named Twifficiency, which advertised itself as follows: “In a nut shell, Twifficiency calculates your twitter efficiency based upon your twitter activity. This includes how many people you follow, how many people follow you, how often you tweet and how many tweets you read.”
The highlighted part looks like a red flag.
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