Mark Cuban is among the growing legions of celebrities and major players in the business world using the micro-blogging site Twitter.com on a regular basis. Last week, Cuban made a comment on Twitter about Denver's J.R. Smith and questioned NBA officials. In turn, the NBA fined him $25,000. On Sunday, Cuban took to Twitter again to comment on the fine.

In the Twitter posts which earned him the $25k fine, Cuban questioned why the officials had not given Smith a technical foul for coming off the bench during a match between the Denver Nuggets and Cuban's Dallas Mavericks:

how do they not call a tech on JR Smith for coming off the bench to taunt our player on the ground ?

And then he posted a second post on Twitter about that same game:

scary part of that play: Same crew chief from game in Denver where they missed call - last play of the game & 1st JRSmith/Wright issue.

The original incident to which Cuban was referring was during a January game where Smith elbowed Antoine Wright in the head, and the refs failed to make a call. The incident that occurred last week was again between Smith and Wright.

In response to having been slapped with a $25,000 fine for his Twitter posts, Cuban posted this on his Twitter account Sunday:

can't say no one makes money from twitter now. the nba does )