A saw a translation of spoken English saying:
hashtag fun to something like:
I’m not seeing a lot of results for
As far as I know hashtag is usually translated as 话题 or 标签 or some combination of both.
Assuming people don’t go around saying things like “hashtag [...]” in Chinese & if someone said “话题...” or “标签...” it probably wouldn’t be readily understood - then perhaps 微话题 is a better option.
微话题 could be considered as overly specific, as a weibo topic.
This is all speculation though.