A week ago I found the new upvote exchange SteemFollower.
The special at this rapid growing service is, that you get upvotes from real users and not from bots. And if you have little Steem Power, you can get upvotes back with worth up to 5x the worth of the upvotes you give.
When I started testing the service, there were nearly 350 users. Well, a week later, there are over 1500 users. My last post has already received an additional 70 upvotes through this service.
Also these site has a working referral system, where you will receive 5% of your referrals upvotes.
If you also want to try out this service, then please use my Referral Link to sign up there:
Thanks @mahdiyari, you made a good service.