[citation needed] In 2010, Gross founded and launched TweetUp, a search engine for Twitter that promotes the best tweeters on any topic.

[6] On January 24, 2011, PostUp acquired popular Twitter client app UberTwitter—after previously purchasing Echofon (for iPhone/iOS) and Twidroyd (for Android OS)—and renamed itself UberMedia.

[7] A Gross company, Energy Innovations, is working on development of a rooftop concentrated photovoltaic solar collector for flat-roofed commercial buildings.

The company has discovered a way to use artificial intelligence and a field of mirrors to reflect so much sunlight that it generates extreme heat above 1,000 degrees Celsius.

[12][13][14] Bill Gross was ousted by the board as CEO in 2023 and in April 2023 made a tender offer to buy the company.