Institute of Policy Studies (IPS) senior research fellow Carol Soon said this could create an "online echo chamber".
"The comments made during parties' live sessions suggest the strong presence of supporters, which means that parties may be preaching to the converted," she said.
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The first episode of the WP's Hammer Show, for instance, drew more than 120,000 views by midnight, noted Dr Soon.
"The same events done in an offline setting are unlikely to attract such large crowds," she said, noting that such online videos can continue to attract viewers even after they have been aired.
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Still, it would be simplistic to say that high viewership or virality will translate to votes, said Dr Soon, citing an IPS survey on the 2015 General Election, which found that the top reason influencing how people voted was the quality of parties and candidates.
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