It is written: 僕達の地球
Boku Tachi no Mirai was created on 2011-08-03.
"tachi" is usually tacked onto another word, indicating more than one. It is only used with words such as "watashi", "boku", etc. For example, "Boku-tachi" is said by a male, and essentially means "My friends and I..." (That is of course assuming that the people he is with are friends. A lot of speaking Japanese is about context.)
'Boku wa koishiteru' is written as 僕は恋してる in Japanese. As you can see, the words 'boku' and 'koi' both use kanji.
If your a girl it would be 私も (watashi mo) If your a boy its 僕も (boku mo)
In colloquial Japanese 'boku' means 'I', so this sentence it would mean, "I don't like you". However for 'boku' to be combined with 'suki ja nai' i.e. I don't like, is odd. It would read, 'Watashi' another personal pronoun for 'I' in Japanese.
Boku is a masculine way to say 'I' in Japanese.(as opposed to Watashi, which is gender neutral)Boku is also more informal (casual).
Watashi no (for a girl) Boku no (for a boy)
"Bokutachi" means "we" or "us" in Japanese. It is a first-person plural pronoun commonly used by males, especially in casual or informal settings.
You could say 'boku wo koroshite kure,' written: 僕を殺してくれ
watashi / boku WA sukottolandojin desu watashi if youre female boku or ore if your male
"Boku" is a casual and informal way for males to refer to themselves in Japanese. It is often used by boys or young men when talking about themselves.
"Kimi to Boku" means "You and I" in Japanese. It is often used to refer to a group of people that includes both the speaker and the listener.