Man, I totally forgot how DMs worked back then.
Also, I used the SMS gateway like crazy with my flip phone.
That was super amazing.
Don't forget that retweets were literally copying the tweet, hitting reply, putting "RT " before the @, and pasting the original tweet after the mentioned username.
THEN you had to creatively shorten it, because you just added about a dozen characters to the original.
Also, no threads. Mentions were just mentions.