I don't know and also i don't try it to search in the other ways like twitter. But it is possible if you want to earn bitcoin then why you are not working in this forum? Because in it you have different and a lot of signature campaigns are here, you could join easily and start to earn.
If you be in campaigns only to earn bitcoins, they would not accept in campaign also first. You be most promising campaign now and please don't give suggestion like this. Newbies will get affected because this. @op. I hope, you have already got a answer about your question. Now you could lock this thread to stop repeated same answers.
Well, I more believe in the you who say that now this OP has already started getting a lot of advice. For if I see also that now this thread is filled with statements or suggestions that are not effective, it would be much better that do not use a signature campaign to get the bitcoin. Because if you just hang on to it, someday surely you won't know where to look for bigger things again. And it would be much better that we should be serious in looking for something