Startup L. Jackson didn’t even say goodbye.
For four years, an anonymous Twitter account delighted and perplexed Silicon Valley, meting out barbed and darkly funny advice about building startups. Few in the insular technology community knew his real name, and his 78,000 followers didn’t seem to care. Top venture capitalists, such as Marc Andreessen, bantered and debated with Startup L. like he was a peer. His tweets were quoted in tech press as gospel. On Dec. 31, he posted a few of the usual snippets, like tough-love tips about how hiring a vice president of diversity was a waste.