Is this sentence correct:
"Social media is a place where people can expose their opinions and ideas."
2. In the context above, does 'expose' mean 'show off'? (It's not that this was my intention, but I would like to learn the exact meaning of 'to expose'.)
Where did you find that sentence?
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expose: exhibit; show; divulge; reveal; disclose; display
It doesn't work well in the context of your sentence. I recommend changing it to 'express'. That's the usual verb. People express (not expose) their opinions and/or ideas on social media.
CJ