A Twitter research tool page in the OSINT Toolkit listing. It notes that some tools require the subject's Twitter account name and lists capabilities such as posts based on keywords or location, profiles by real name or account name, account bio changes, tweets between specific dates, media search, keyword and account analytics, and mutual follows.
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followerwonk.com
Searches Twitter bios and profiles to find accounts by keywords, interests, locations, or roles.
followerwonk.com
Followerwonk is a Twitter analytics service offering follower tracking and bio search. It provides follower and unfollower tracking, account comparison, bio search with boolean operators, follower demographics, engagement metrics, bot detection, and export of follower lists, with options to search accounts across multiple platforms.