Dan Siroker (@dsiroker) — Twitter Score 130 out of 1000

Dan Siroker is an AI product founder who co-founded Limitless and Optimizely, with Limitless having been acquired by Meta to help build AI-enabled wearables. Dan Siroker's Twitter Score is 130 out of 1000 (an Excellent rating) as of October 2026, ranking #4,767 (top 1%) among 493,668 tracked accounts.

Dan Siroker co-founded Optimizely alongside Pete Koomen, with the company completing the Y Combinator winter 2010 seed accelerator program. Optimizely went on to raise a Series B led by Andreessen Horowitz and a Series C led by Index Ventures, with participation from a broad group of investors including Benchmark, Bain Capital Ventures, and Salesforce Ventures. In July 2017, Siroker transitioned from CEO to Executive Chairman of Optimizely, and Episerver subsequently announced a definitive agreement to acquire the company in September 2020.

Dan Siroker co-founded Limitless, which describes itself as creating tools that augment human intelligence with artificial intelligence, focusing initially on memory and focus. Limitless raised over $33 million from investors including Sam Altman, First Round Capital, Andreessen Horowitz, and NEA. Following the Meta acquisition, Limitless stopped selling its Pendant hardware as of December 5, 2025, began sunsetting the Rewind app, and has committed to supporting existing Pendant customers throughout 2026.

Dan Siroker has 38,481 followers as of October 2026 and has published 3,543 posts. Dan Siroker has been mentioned by 88 accounts a total of 185 times.

Who follows Dan Siroker on X?

The accounts that follow Dan Siroker include 594 founders, 196 angel investors, 88 influencers and 17 VCs, among them Marc Andreessen, Sam Altman, Chris Dixon, Nikita Bier, 6529 and Paul Graham.