DotA2 - Original Thread

Generally speaking it can be used in two different ways:
1: The aggressive way, you get into the middle of enemies with your invis and then pop your ulti and allowed your allies to wreck targets that can't get free since they can't run and can't get closer to allies.
2: The defensive, use it and run.
Blink isn't needed on treant at all. More standard items are:
Necronomicon.
Mekansm.
Sheepstick.
Shiva's guard.
Refresher orb.

Not all of them, they're just situational and you can pick them up depending on the game. Orchid of malevolence also works on him against certain heroes.

Also about the whole dotabuff incident, this gives good insight in what the pineapple went down:

 Spoiler

Terrafros:

"I must point out that everything we know now is based on assumption and speculation.
Mind you, it is not the privacy setting that DOTABUFF shut down from. It is the fact that Valve closed the method that DOTABUFF was using to get data from Dota 2.
There are two APIs. One is for the client, and intended only for the client, which gives access to everything which includes steam friends lists, replay urls, for a while it even showed your MMR. The second API is a WebAPI, that was specifically designed for third parties like DOTABUFF to pull data from and build sites around. However, instead of using or waiting for the WebAPI to finish implementation, DOTABUFF chose to use a method which deceives the Valve servers into thinking that their own data aggregation programs are actually the Dota 2 client.
There now is a WebAPI, that is fully supported by Valve, and accessible by every single person that wants to use it, even you and me. Unlike DOTABUFF's method, it is not illegal, and it is likely going to receive a lot of development to show a lot of useful features.
So, to summarise: DOTABUFF pulled data from the Valve servers using a backdoor into the API intended for the Dota 2 client, and Valve decided they did not want third parties to use this backdoor and use the actual official provided WebAPI instead. The fact they asked people payment for this illegal method probably played a part as well."