1. All major QQ groups and WeChat groups can be found by searching for "questionnaire mutual assistance", and many friends have filled it in.

2. Some open platforms, such as Weibo, Post Bar and Douban, have some mutual filling institutions. For example, there are topics in Weibo, various categories in Post Bar and groups in Douban, but these timeliness cannot be guaranteed. Generally, you don't reply immediately after posting.

3. Taobao or private mail, there are a number of sample sellers, generally 1 wool or 20 wool samples, but this should be paid attention to, don't be cheated, be sure to find honest sellers.

4. Questionnaires have their own sample collection platforms, such as Woxiao Crowdfunding, Questionnaires Network, Questionnaires.com, etc., which can publish questionnaires and collect questionnaire fees. Generally speaking, for newcomers, the platform will provide a discount on how many copies to collect for free. Such sample data will generally be more accurate and have higher reliability and validity, which is also commonly known as the guarantee.