Your argument is flawed because you're making it seem like Facebook competing with Twitter is a technical problem, when it isn't, it's a social, branding and ma

Your argument is flawed because you're making it seem like Facebook competing with Twitter is a technical problem, when it isn't, it's a social, branding and marketing problem. People use the products in different ways. Twitter is associated and popular in the public consciousness on "public updates" while Facebook isn't, and Twitter has a buzz behind it that Facebook doesn't. By using the same logic as yours, Facebook Marketplace should have beaten Craigslist by now. Or Match.com should have beaten plentyoffish. Or, hell, Reddit should have beaten Hacker News. But they haven't happened, despite all being technically superior and having supersets of the others functionality.