
一 | London, Oct 12 (UNI) Refugee families in Syrian camps are begging for donations on TikTok while the company takes up to 70 per cent of the proceeds, a BBC investigation has found.
Children are livestreaming on the social media app for hours, pleading for digital gifts with a cash value.
The BBC saw streams earning up to $1,000 (£900) an hour, but found refugees received only a tiny fraction of that.
TikTok said it would take prompt action against "exploitative begging", the BBC report said.
The company said this type of content was not allowed on its platform, and it said its commission from digital gifts was significantly less than 70 per cent. But it declined to confirm the exact amount.
Earlier this year, TikTok users saw their feeds fill with livestreams of refugee families in Syrian camps, drawing support from some viewers and concerns about scams from others.
In the camps in north-west Syria, the BBC found that the trend was being facilitated by so-called "TikTok middlemen", who provided families with the phones and equipment to go live.
The middlemen said they worked with agencies affiliated to TikTok in China and the Middle East, who gave the families access to TikTok accounts. These agencies are part of TikTok's global strategy to recruit livestreamers and encourage users to spend more time on the app, the BBC said.
The gifts they're asking for are virtual, but they cost the viewers real money and can be withdrawn from the app as cash. Livestream viewers send the gifts - ranging from digital roses, costing a few cents, to virtual lions costing around $500 - to reward or tip creators for content.
For five months, the BBC followed 30 TikTok accounts broadcasting live from Syrian refugee camps and built a computer program to scrape information from them, showing that viewers were often donating digital gifts worth up to $1,000 an hour to each account.
Families in the camps said they were receiving only a tiny fraction of these sums, however, the BBC report said.
TikTok influencer and ex-professional rugby player Keith Mason donated $330 during one family's livestream and encouraged his nearly one million followers to do the same.
When told by the BBC that most of these funds were taken by the social media company, Mason said it was "ridiculous" and "unfair" to families in Syria.
"You've got to have some transparency. To me, that's very greedy. It's greed," he said.
TikTok's rules say you must have 1,000 followers before you can go live, you must not directly solicit for gifts and must "prevent the harm, endangerment or exploitation" of minors on the platform.
After the BBC contacted TikTok directly for comment, the company banned all of the accounts.
It said in a statement: "We are deeply concerned by the information and allegations brought to us by the BBC, and have taken prompt and rigorous action.
"This type of content is not allowed on our platform, and we are further strengthening our global policies around exploitative begging."
TikTok, the world's fastest-growing social media app, has made more than $6.2 billion in gross revenue from in-app spending since its launch in 2017, according to analytics company Sensor Tower.
UNI ING。 研究人员利用人工智能解码基因激活中的关键DNA序列。图片来源:美国加州大学圣迭戈分校官网 美国加州大学圣迭戈分校研究人员利用高通量DNA测序和人工智能技术,解码了人类基因中一段名为“起始子”的关键DNA序列特征。这项成果为解析基因表达调控规律和预测DNA突变影响提供了新工具。相关论文发表于最新一期《基因与发育》杂志。 人体不同类型的细胞虽然拥有基本相同的DNA,但由于被激活的基因不同,最终能够形成不同的细胞类型,并执行各自特定的功能。DNA中的一些特殊片段负责精细调控基因表达,使细胞产生酶、激素、蛋白质以及维持细胞结构和功能所需的其他重要成分。如果这些基因没有被正确激活,细胞可能无法正常发挥功能,并可能引发包括癌症在内的多种疾病。 为了进一步弄清DNA中哪些序列负责启动基因表达,研究人员将目光投向了“起始子”。这是基因表达过程中的一个重要DNA区域,是基因编码的信息开始被表达,进而产生具有功能产物的关键区域。 研究人员利用高通量DNA测序技术,检测了约50万个不同“起始子”序列的基因表达活性。随后,他们将这些实验数据用于训练机器学习模型,使AI能够识别“起始子”特有的DNA序列模式。 利用训练出的模型,研究人员进一步在人体基因中搜索“起始子”的特征序列,发现约60%的人类基因含有“起始子”。他们表示,这些AI模型首次能够预测人类基因中是否存在“起始子”,并解码其DNA碱基序列模式。相关数据和模型还可用于预测“起始子”相关DNA突变的影响,以及设计具有特定功能的合成启动子,即能够调控基因开启和关闭的DNA序列。

二 | 研究人员表示,人类每个细胞中都包含约60亿个DNA碱基,其中蕴含着决定基因何时、何地,以及以多大程度表达的复杂“密码”。

三 | 此次建立的“起始子”AI模型只是解析这一基因表达“密码”的一小部分,希望未来进一步扩大模型范围,以更加全面地解析人类基因表达调控规律。(记者张佳欣)。
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