Meetup is a really weird site. It's objective is to put people in groups according to their interests. It is certainly no place to go if you are job hunting.
Twitter seems to be a place where comments are made. Most would be personal. Donald Trump uses it to set policy. Most likely he is the first president to use that.
Facebook for those who have sent me things, is somewhat the same. I wouldn't trust it to find a job.
MySpace no longer exists. So it is not a place you'd put an ad for a job. I think myspace was used for photos.
That only leaves the 4th one down. Submit that one.
