This is an OLD linking method around 2-3 years old method – i dont even remember exactly. Back in time when this glitch was found i was even exchaning high pagerank sites with 1 of this blogs readers on email 
Back then it was working even simlper than now – using the “likes” [after you read the post you will know what i mean] but then they put nofollow on those.. We tried to keep this method as a secret and not saturate it but since seems the method now after such a long time got to the public and its spreading.. lets burn it down totally just like we did with other platform before If you know this blackhat seo trick, then just check last part about automation.
Actually they did put nofollow on reblogs now too. Seems the method is really close of death and without nofollow wont have as much impact. I leave article in original version.
How To Get Free PR Backlinks from Tumblr?
This blackhat tactic is as easy as 1-2-3. Its good to use real email but you can even use made up one – mostly they dont require verification even tho they ask for it..
This linkbuilding method will work for pharmacy, casinos, foreign sites
1. Make an account at https://www.tumblr.com/, as an username use your future anchor. If its taken use umbers on the end or dashes. Ie. DogFood13224 Dog-Food. Method is old, so most anchors are taken.
2. After creating account [and verifng email if you want - better do that to be able to fix stuff if needed] go to the settings: www.tumblr.com/blog/YOURUSERNAME/settings
3. Below the text ‘URL” tick box Use a custom domain name and write your own adress without http:// so ie. dogfood.com. Browse to the bottom and click save.
4. Now if you go to any tumblr post made by a person and you are logged into Tumblr in the top right corner you have few buttons: 
.
First one is “like”, second one is “reblog”. If you click “like” you get nofollow high pagerank link straight away. If you click reblog, you need to click again “post” and its also done. No need to change anything or whatever. Just 1 extra click and you get ie. free PR5 dofollow backlink.
They are shown this way with anchors:
5. Now find high pagerank posts and like or reblog them – viola Tumblr backlinks done.
How to find? Grab BestSEOSuite, Hrefer or any other scraper that has pagerank checkin built in and use footprint:
site:tumblr.com “reblogged this”
site:tumblr.com “liked this”
Then just go for it baby! Free highpage rank links form very google trusted domain.
Security Knowledge to Automate Tumblr?
Thre are two ways about beein able to self-code Ubot Studio or the big daddy of all bots – ZennoPoster.
ZennoLabs just released beta of ZP4, and even tho the software was awesome now its even better and faster. Im totally all in for that automation software esp that in account creation it pwns Ubot. This is superb and 100% stabile software that never dies. Tumblr mainly allows adult and the mods aint scrict but i highly suggest to use My Private Proxies [they DO ban ips on tumblr so better to have proxy], and you will meet recaptcha so ie. Captcha Sniper wont work here for now. ZP also has no problems with ajax and javascript buttons used in Tumblr account creator so making this gem is preety easy.
Other thing to notice is,they change languages based on IP so if you make a bot try to make the buttons by their name not what they say. Its almost impossible to change language to english stright from panel or so. IF you dont want to bot it just use hands.. Maing thing is – you dont need to post on all 1000s of high pagerank pages you find as its same domain.. Just post at like 10 and will be good enough.
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Sorry dude, they nofollow’ed reblogs too recently, sometime in the last few weeks.
good call bro, didnt check it since some time but i was assuming this would happen.
good part is google still follows ‘nofollow’ links but mainly that makes the method worth way less.
Good article but reblogs is now NoFollow
Is this method completely dead? You need to change the domain’s A record to point at tumblr now if you want to use a custom domain. Won’t that just make your site forward to the tumblr blog? Is there a way around that now?
just dont click ‘verify’ for the nameservers and will be fine. so far they didnt force that
very usefull, thanks for sharing!
How many has just been hit by the new google penguin update?
Will tumbl articles help?
I’ve never heared before for Tumblr. Realy interesting, will give it a try
Thanks for sharing this is new technic for me.
My old site was hit by the panda because of the russian sape links
Nice one
Will give it a try 
My question is how to create backlinks to my wp-blog using tumblr. I was thinking to post in tumblr using my wp-blog’s content and link into the page. Do you think that will work ? is that links will no-follow ? please reply me.