Should I ever strongly suggest support raisers to use or not use social media?
I would never strongly suggest that support raisers use Social Media.
Social Media isn't a miracle cure. It might take sometime before a person's Social Media investment pays off... it might never pay off. It's not a "one size fits all"; do what is right for you. Keep trying different methods.
It's just one tool: Don't over-invest. Don't neglect conventional media--you might leave our core supporters. Don't under-invest either.