Is it the only difficulty? I didn't do that, but I know person who did. He just posted link to his questionnare in the FB publics devoted to psychology. He ask

Is it the only difficulty? I didn't do that, but I know person who did. He just posted link to his questionnare in the FB publics devoted to psychology. He asks his contacts (he is also have not a lot of contacts) to repost, describing how it important to him. It allowed him to gather a few hundreds of participants in a week. As for my thoughts, I think that it is important to make a short introductory description of questionaire, to tell potential participants why this research is important. Motivation is very important. It would be great if after answering questions participant will be rewarded, for example, if you tell him/her something interesting for him/her. The most of participants have a hope to learn something about himself, if you can give him feedback of this kind, based on questionaire, I belive, it can help to attract more participants. Alternatively you can promise them feedback in the future after data processed. It can help, I participated one time in such a research.