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Try sending them a small 0.001 Steem transfer through Steemit and write your message in the memo field, or try commenting on one of their recent posts and mention their username starting with the "@".

Contact @blocktrades ASAP regarding this. You can comment on one of their recent posts and explain what is going on.

Okay memo'd both blocktrades and Ned. Hoping I can get my 20sbd back but not holding my breath. Good learning experience Aha

Thanks ebargains <3

Hope you do get the funds back somehow. There are some proposals for anti phishing plugins for Steem, but none are usable for now.

Best to be vigilant (check the spelling of the URL and the HTTPS tag) and don't click on links that you do not recognize.

Oh yeah, also let @good-karma know that there is an imposter using an account name similar to his to scam people.