While there is no special proof that .tk domains will rank lower, Google has a KB page explaining that most widely used ccTLDs will NOT be used for localization:
Google treats some ccTLDs (such as .tv, .me, etc.) as gTLDs, as we've found that users and webmasters frequently see these more generic than country-targeted. Here is a list of those ccTLDs (note that this list may change over time).
.tk is a country code domain for Tokelau. I imagine these are not ranked highly in other countries. I believe they use it for localized search results - http://www.seroundtable.com/archives/021424.html
EDIT I stand corrected - ABerezovskiy's answer should be accepted since google treats it as a gTLD.
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虽然没有特殊证据表明 .tk 域名排名会较低，但 Google 有一个知识库页面解释最广泛使用的 ccTLD 将不会用于本地化：
While there is no special proof that .tk domains will rank lower, Google has a KB page explaining that most widely used ccTLDs will NOT be used for localization:
.tk 是托克劳的国家代码域名。我想这些在其他国家排名并不高。我相信他们将其用于本地化搜索结果 - http://www.seroundtable.com/archives/021424 .html
编辑 我立场正确 - ABerezovskiy 的回答应该被接受，因为谷歌将其视为通用顶级域名 (gTLD)。
.tk is a country code domain for Tokelau. I imagine these are not ranked highly in other countries. I believe they use it for localized search results - http://www.seroundtable.com/archives/021424.html
EDIT I stand corrected - ABerezovskiy's answer should be accepted since google treats it as a gTLD.