Of course the obvious answer is going to be your friends. While, it be in real life and the internets. Of course after you've been around for awhile you're friends won't need anymore invites for you to share. So what's a person who wants to share invites to do? Some may do a giveaway so that they can attract a gaggle of potential invitees, some may just lurk around in people request threads and invite them in private. I personally like doing giveaways because I'm eager to see who I know, like, and trust that I can help out. Giveaways enable shy people, or people who don't want to look completly needy the ability to express their interest without really having to put themselves out there. The biggest criticisms of giveaways is that there are alot of "free sample" giveaways where it seems the person doing the giveaways is giving them away to anyone. The carefully done giveaways are done in such a fashion where the results aren't going to manifest themselves publically, thus the public won't know of what good has been done. All in all it just depends of the inviter and how much they care about their trackers.
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