The authenticity of the signed photos obtained by the official lottery through this channel is very guaranteed, but the number of official lottery is limited and there are many people participating in the lottery, so the probability of winning the prize is very small. Always pay attention to the official news so as not to miss it. However, this way is friendly and safe, and it is a way with zero threshold and zero loss. (In addition to Weibo, there are super-star rice balls and other apps, you can go and have a look).
There are several situations through the omnipotent "circle of friends": your friend's friend happens to be your favorite artist, and your family has a company to cooperate with your favorite artist. If you can get the autograph of your favorite artist for free through this channel, you may even become friends (already dreaming), but this channel can't be bought for free.