ThatHigh.Com is a website where stoners post up there funny thoughts, or ideas and dare others to agree that they really are "That High". If you like what they have to say you click "puff" and if you don't you can "pass".
All of the little quotes will have you remembering a time when you were also That High. Alright that's enough with the clever word play, I guess I'm just that high. (last one)
Anyway, the site also has a twitter and they've made the #thathigh trend popular amongst stoner tweeters and the like. They sell cool stickers too. Check them out. ThatHigh.com