Dot.TK Is a giant parking page SCAM set up to lure you in by offering FREE domains only to bait and switch you once your website traffic starts rolling on in.
In my case, they stole several of my high traffic domains without any notice and parked them to earn money from the backlink traffic. No notice was sent to me as to why, nor was I able to reclaim them by any means. My phone calls and faxes fell upon deaf ears as well.
Webmasters beware! I confirmed this by setting up a dummy domain and then blasting it with visitors. Once the count got to be above 500 per day, the domain myteriously disappeared from my account!

Another poor aspect of this company is that they do not respond to email contact...that is, if you can find any!
I will never recommend to anyone to use this TLD for registering any domain. You're much better off with a .info compared to these crooks.

Interesting feature: you are getting 2nd level (!) domain for your URL in .tk zone. Sad "feature": your link will be deleted if it won't recieve at least 25 visits during 90 days.

The most exciting feature of the user registration in the domain zone TK is in the fact that it is free for anybody. Until recently, the administration of the domain TK (Tokelau, a territory of New Zealand located in the South Pacific) in exchange for the free registration applied forced ads on your page.

Recently, the situation has changed for better. On the 32-nd International Conference ICANN, Dot TK administration announced that from now on the forced ads will be completely removed from the pages with registered free domains, and will not be placed on the newly registered sites as well. This positive marketing step attracted more users to choose the short name for their Web Site or blog to be forwarded to.

There are some limitations for the domain TK use:
1. Sites not visited at least 25 times in consecutive 90 day periods are automatically canceled to avoid the domains being unavailable to more active websites.
2. Internet service provider Road Runner on Time Warner Cable, continues to block sites with the .tk domain, in spite of the significant pressure from the Internet community.

Dot-TK recently provided .tk websites the option to join a network called TiKinet, a close-knit network that links sites to each other based on key words called TiKilinks. The network is expected to increase traffic to the websites, many of which are personal sites and blogs operated by individuals who otherwise would have no way to advertise their sites. You have the opportunity to check the traffic flow through your domain as well. Following test sign up for one of my blogs, I noticed immediate additional traffic through new doorway, not huge, but more than I expected.