Get one or more Twitter user profiles by IDs or usernames (1-100 per request). Use identifierType="id" for numeric user IDs, identifierType="username" for usernames. All identifiers must be the same type. For single user: pass array of 1, e.g. identifiers=["elonmusk"]. For person names or fuzzy search, use searchTwitterUsers instead. PERFORMANCE: More efficient than multiple single calls, but can still take time for many users. Returns only found users, omitting not-found identifiers for flexibility. Optional fields parameter for performance (default: ["id", "username", "name"]). Available fields: id, profileImageUrl, profileBannerUrl, profileInterstitialType, status, username, verifiedType, name, description, location, protected, verified, followersCount, followingCount, tweetCount, listedCount, likesCount, mediaCount, pinnedTweetId, source, nLang, nLangsFiltered, label, labelType, isVerified, modifiedAt, createdAt, verifiedSinceDatetime, accountBasedIn, locationAccurate, usernameChanges, lastUsernameChangeDatetime. NOTE: Use "tweetCount" not "statusesCount". Returns: array of user profiles with count and dataSource. This is a safe, read-only tool for analyzing searchable information.