Need 2-3 Character Usernames

I need a concise list of ultra-short usernames—only two or three characters long—that could realistically be registered or claimed on today’s major social or SaaS platforms. Every name may combine letters and numbers in any order; there is no requirement to start with a letter, end with a number, or follow a fixed pattern.

Your task is to research availability, compile the candidates, and deliver them in a simple spreadsheet showing:

• the exact username
• the platform on which it’s currently available (please check at least the big four: Twitter/X, Instagram, TikTok, and GitHub)
• the date/time you verified it

I’m interested solely in these ultra-short handles, so skip anything longer than three characters. A clean, well-organized sheet and verifiable availability snapshots will be the basis for acceptance.