I understand you can track Hashtags, other companies, keywords etc. through Hubspot Twitter Stream. However, is that focused only on Twitter? Can you track Hashtags and other content across different Social Media platforms (i.e. Instagram, Facebook)?
“Listening” for keywords is indeed limited to Twitter. You can find a nice overview of what’s supported (and what isn’t) for Twitter, Facebook and LinkedIn in this knowledgebase article on social inbox monitoring.