Threads is a cloud-based intelligent message hub that captures, transcribes, and organizes all of a company's digital messages, emails, and phone calls into one easily searchable database.

B2B is a completely different marketplace than B2C, and “internal search index of company’s digital messages” is a different industry than “social media app.”

The company’s own trademark registration indicates the trademark applies to “computer software, software and apparatus for the extraction of business information and knowledge.” That doesn’t sound like a social media app to me, either.