By Zoe Kleinman
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The co-founder of Cameo, a service which allows fans to buy personal video messages from their favourite stars, says the traditional A-list celebrity is "a thing of the past".
Speaking at Web Summit, Steven Galanis said the biggest stars now were those with huge followings on digital platforms, like YouTube and TikTok.
Former US boy-band star Lance Bass spoke of his experiences.
He said having a catchphrase had made him in demand with Cameo users.
Bass, a member of the 1990s boy band NSync, has recorded more than 10 hours of short video messages for fans since he joined Cameo in 2018.
He said 80% of his requests involved him saying the catchphrase "bye bye bye" – also the title of one of the band's greatest hits.
He said his favourite videos were messages recorded for couples to see at their weddings, and added that he was wary of being pranked.
"I think you're always looking for that request – sometimes you think people are fooling you to say something off the wall," he said.
"I haven't had many of those."