The reason they require following people you add to a list was because on Twitter trolls and bullies were using lists to manage lists of victims.
By requiring you to follow them, people can control who has them on a list and block people if required.
@leighms @PatrickOBeirne @Debs
By the way, the reason only hashtags are allowed in searches is largely a safety feature, it's to make it harder for trolls to find victims.
By using hashtags, people are opting into their posts being discovered for certain topics.
Not everyone agrees with this approach as it does make it more difficult for new people who are used to general text searches.
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