I always mask my link by putting it on a public facebook page and sending that link. Fiverr wants traffic to come from social media, not forums like this.
Definitely DO NOT just order and immediately mark it as complete and review it. Give it some time. Time it out like a natural order. I was considering keeping a few orders in queue just so it makes my gig look more in demand. Don't rush it.
Another thing I have considered but not tried yet is searching for the service you plan to trade. So if I'm going to buy a twitter followers gig from you, first I'll search twitter followers, click around a bit, look at some other gigs....then buy yours. Makes it look more natural.
And yes Fiverr does pay attention to those things. Every time I go and compare my gigs to others I get emails pointing me to other services similar to the ones I was searching.
But yea... very interested in doing an exchange. I have some new gigs that I'm hoping take off soon. I am a US seller if that matters to you. I can do a couple reviews. Please PM me. I don't use Skype.