there vs their vs they're

[kakomu]

There's nothing wrong with writting "they're" instead of "their" once in a while but some people here do that all the time.

it may be one thing to replace there for their, but using they're in place of there or their is TOTALLY inexcusable, since it's a contraction of they are. For instance, in the line I quoted, saying "they are's nothing wrong with writing" sounds totally wrong and not too hard to discern.