I registered the domain name Downvote.xyz and the username @downvote.xyz for this purpose.

If you are interested in using it, please contact me at chris@steem[dot]ph since I think it is a good name.

XYZ can stand for anything so "Downvote XYZ" means to downvote something.

P.S. We have Steem meetups every week in the Philippines at Steem.com.ph.