While tech companies are increasingly focused on making their products faster, cheaper, and easier to use, they’re also making them more addictive than ever before. That’s a problem for adults and children alike – but the latter are perhaps in more danger of feeling the ill effects of being hooked on technology. An open letter to Apple, penned by two investors who have a combined stake of $2 billion in the company, urges the Cupertino-based firm to expand its efforts in creating parental control functions for its mobile devices. Investment firm JANA Partners and The California State Teachers’ Retirement System…

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