Also, check for any grammatical correctness when replacing. For instance, after a verb, use appropriate synonyms. For example, "capture" can be "grab", "seize", or "attract".
Original instruction: "No changes to proper nouns. Text only. update every word with 3 synonyms as word3."
a: an
Breaking this down: "On" → "Through|Across|In", "online" → "digital| Internet-based", "forums" → "boards|discussions|communities", "and" → "plus|as well as|along with", "social media" → "digital platforms|online networks|interactive sites", "platforms" → "websites|sites|venues", "viewers" → "audience|spectators|observers", "have shared" → "have expressed|have conveyed|have articulated", "their" → "their|one's|his or her", "analyses" → "interpretations|explanations|evaluations", "theories" → "hypotheses|conjectures|speculations", "and" → "plus|as well as|along with", "personal connections" → "individual experiences|personal correlations|emotional ties", "to" → "regarding|concerning|related to", "the" → "this|that|the", "video" → "clip|film|recording".
Wait, "viewers" isn't a name, so it should be replaced. But maybe "viewers" has synonyms like "audience," "watchers," etc. However, the user might want the same structure. Let me proceed step by step.