the laundromats that use it to let you know when certain washers or dryers are finished.
I particularly like those tweets when I'm not even doing laundry that day!
The realtors that let you follow them so you get regular updates about new home listings
Real estate is a fantastically particular business. I would like to meet the person that wants to drown in every tweet from just one realtor or one agency.
When I've looked for a home, the realtor and I were busy defining exactly what we were looking for. In short order we had a short list. We checked out that list. If that didn't work out, we re-defined and repeated.
The process had absolutely nothing to do with breathlessly tweeting out every gasp in the real estate market and everything to do with being specific.
FWIW, this sounds like it might be a job for RSS or email...but the notion of having to sort through tweets is ridiculous. Another problem with tweets is you would have to follow the link to learn anything at all -- there would be no room to describe the listing (unlike in RSS or email).