微信再开放520元大额红包！限时一天

Group 1 - The article highlights the significance of the Qixi Festival in China, which has evolved into a symbol of love [1] - WeChat has increased the limit for its special "520 red envelope" to 520 yuan for a single day, a tradition that has been maintained for over nine years [1] - On Valentine's Day and Qixi Festival, the top four cities for sending and receiving "520 red envelopes" are Shanghai, Beijing, Shenzhen, and Guangzhou [1] Group 2 - In 2021, individual users received over 200 "520 red envelopes" and sent more than 150 on average [1] - The number of males sending "520 red envelopes" is 3.5 times that of females, while females receiving them is 3.9 times that of males [1] - On this day, over 123,000 "520 red envelopes" sent were not claimed [1]