Twitter Censorship?

Is Twitter censoring your status update?

I've been Twittering more often this past few days. But as I'm beginning to like this service, I was just surprised of what happened to my previous status updates. Earlier today, I posted the following Twitter status:

It's hard, but I need to continue. I know the benefit is long term. 
So I'll see you guys at the gym and interact in the real world #sxsw =D.

After few minutes, my update disappeared.  I assumed deleted on purpose. Maybe because they don't want me to tag it with #sxsw. So I reposted the same status message pictured below and removed #sxsw before going to the gym.

When I got back, the same status vanished! And my status back to this older Twit.

Hmm. Did Twitter censored my update because of the phrase "interact in the real world"? I hope it's just a system glitch. Because that level of censorship is appaling.