Sure - you get the proper meaning from saying it aloud. Two/too/to all have the exact same sound. It comes from sms, where you have a limit on characters and you need to abbreviate. Eg. "C U L8R 2day" said aloud is "see you later today". Keep the usage to sms and chats. In an essay, blog, or even a comment posted online, using sms shorthand is laughably bad English. 881! ^^

They both sound almost the same. Although everybody has been doing that and it's kind of cool and modern to use, I still think it's not advisable to replace "to" with 2. Why be lazy to type the original word? Anyway there are just 2 alphabets in "to".

don't worry about this. when people talking on line , they often use everything which make sens for the understanding.....the idea that u understand. it depends the time , cause they won't take many times to write what they want to say....i mean : a short writting for a long conversation. for example: i want 2 go 2 school, will u go with me? U = you , 2 = to , and so on.... take care

yes we use that for anytime we want to say any version of to, too, or two. we are too lazy to fully type it out, so we just use 2 for it all.

Obviously yes, 2 means "to" or even "too" sometimes, there are no rules when it comes to abbreviations, we use it in sms 2 :-)