There’s a merit to say that technology is connected to all sort of fields and purposes today, but that doesn’t make it less of technology, or the companies behind them less technology-focused.
My contention is that the use of technology is so universal that it's not meaningful to call a company a technology company just because they use a lot of technology, even if they have to create a lot of it themselves. Pretty much every big company has on-staff software engineers making and implementing custom technology. It takes a lot of technology to make a law firm work but that doesn't make a law firm a technology company. If we use too-expansive of a definition for what's a technology company, then it applies to almost every company, making it a useless term.
I do not think social media companies are technology focused. They just use technology to achieve their social media (/advertising) business goals, the same as every bank, every hospital, every trucking company, etc.